Use maps to explain how Mongol conquest reshaped China and Korea, and why Japan's warrior government survived

Learning goal: Explain how the Mongols conquered much of Asia and how that conquest led to unified states in China and Korea, explain why the Mongol failure to conquer Japan allowed Japan's warrior-based ("feudal") system to continue, and use maps and other geographic models to show how people interacted and exchanged products and ideas over time and how geography influenced these historical events. This lesson teaches Ohio's 2026 social studies standards for Grade 7, published in July 2026. The Ohio Department of Education and Workforce anticipates that districts will begin implementing the 2026 standards in the 2027-28 school year.

Maps as evidence. A historical map shows where something was at one moment. A map sequence is a set of maps of the same region at different dates; comparing them shows change over time. A route map uses lines and symbols to show movement of people, goods and ideas. A physical map shows landforms and seas, which helps explain why events happened where they did.

The steppe and the rise of Chinggis Khan. The Mongols lived on the steppe, a vast belt of dry grassland stretching across Central Asia. Farming was difficult there, so Mongol families were pastoral nomads: they moved their herds of horses, sheep and other animals between seasonal pastures. Mongol men were usually skilled riders and mounted archers. Grassland meant horses, and horses meant fast-moving armies that could live off their herds. In 1206 an assembly of Mongol leaders proclaimed a chief named Temujin as Chinggis Khan (often spelled Genghis Khan), ruler of the united Mongol peoples.

Reading the expansion as a map sequence. Historical atlases show Mongol-ruled lands on a sequence of shaded maps. This lesson gives you the information those maps show as a map-sequence table, a simple geographic model: each row is a region, listed from west to east the way it would appear on a map, and each column is one map date. "Ruled" means the region would be shaded on that map. Reading across a row is the same as comparing the same place on three maps.

On a map of about 1227, the year Chinggis Khan died, the shading covers Mongolia, much of Central Asia and parts of northern China. On a map of about 1259, the shading reaches from the edge of Korea to the lands of the Rus' in eastern Europe and into Persia and Iraq; the Jin state of northern China had fallen in 1234. On a map of 1279, all of China is shaded, but the empire is drawn as four separate khanates (Mongol-ruled states), because the family of Chinggis Khan had split after about 1260. Read in order, the maps show the speed and direction of growth and the empire breaking apart, which no single map could show. The diagram in this lesson is a second geographic model: a schematic, not-to-scale drawing of the East Asian part of the 1279 map, with its key showing which lands were Yuan territory, which was a dependent kingdom and which was never conquered.

A route model of exchange. A route map can also be written as a list of stops, the way a legend would describe it. One main overland route under Mongol rule ran from Dadu (today's Beijing) across northwestern China and Central Asia to Tabriz in Persia and on to ports on the Black Sea, with yam relay stations along the way. Moving west along it: silk, porcelain, and the ideas of Chinese printing and gunpowder weapons. Moving east: horses from the steppe, and Persian astronomy and medicine. Religions moved in both directions. Each item can be drawn as a symbol on the route in the direction it traveled.

Exchange across the empire. Once the Mongols ruled from China to Persia, approved travelers could cross Eurasia more safely. The Mongols built the yam, a network of relay stations where official messengers could change horses and find food and shelter. Travelers carrying a paiza, a metal or wooden tablet that worked as a safe-conduct pass, could demand help along the routes. Merchants moved silk, porcelain, spices, furs and horses. Ideas moved too: Chinese printing and gunpowder weapons, Persian astronomy and medicine, and Buddhist, Muslim and Christian teachings all found followers at Mongol courts. The Venetian merchant Marco Polo said he served the court of Kublai Khan for many years; his book made Europeans curious about Asia, though historians debate some of its details. The same routes could carry disease. Many historians think the plague known as the Black Death spread west along trade routes across the lands that had been linked under Mongol rule and reached the Black Sea and the Mediterranean in the 1340s, although the exact path is still studied.

China: from division to one government. Before the Mongols, China was divided. The Jin ruled the north, the Southern Song ruled the south, and other states such as the Western Xia held lands in the northwest. The Mongols conquered the Western Xia in 1227 and the Jin in 1234. Chinggis Khan's grandson Kublai Khan proclaimed a new Chinese-style dynasty, the Yuan, in 1271, with its capital at Dadu (today's Beijing). The Southern Song were harder to defeat because rivers, canals and rice paddies slowed cavalry; the Mongols had to build fleets and use siege weapons. In 1279 the last Southern Song forces were defeated, and all of China, north and south, was reunited under one government. When the Ming dynasty replaced the Yuan in 1368, China stayed one unified state.

Korea: survival, then a new centralized kingdom. Ohio's statement reads: "The Mongols conquered much of Asia which led to unified states in China and Korea." For China this is accurate, as the section above shows. For Korea the accurate history is more exact. Korea had already been unified long before the Mongols, by the Goryeo kingdom in the 900s. Mongol armies invaded Goryeo many times beginning in 1231, and the Goryeo court retreated to Ganghwa Island, whose sea channel the Mongol horsemen could not easily cross. After decades of war that caused great suffering, Goryeo made peace and submitted, in stages from about 1259 to 1270. Goryeo's royal government survived under Mongol overlordship, meaning its kings kept their throne but obeyed the Yuan emperors, married Mongol princesses and supplied ships and soldiers. It did lose territory: the Mongols placed parts of the north and, for a time, the island of Jeju under their own direct administration. Some areas were returned, and Goryeo won back the northeast in 1356. When Yuan power collapsed in the 1350s and 1360s, Korean leaders pushed out Mongol influence. In 1392 the general Yi Seong-gye founded the Joseon dynasty, a strongly centralized state that lasted more than five centuries. A careful way to connect this history to the statement: Goryeo's royal government came through Mongol domination, and the collapse of Yuan power opened the way to Joseon, a strongly centralized Korean state. Korea was not first unified by the Mongols, and Mongol rule itself took Korean land for a time.

Japan: geography and defense. Japan is a chain of islands. To reach it from Korea, an army must cross the Korea Strait, more than 100 miles of open sea with the islands of Tsushima and Iki along the way. Kublai Khan sent invasion fleets in 1274 and 1281. Both times the invaders attacked Tsushima and Iki and then Hakata Bay on the island of Kyushu; in 1274 they landed and fought, then withdrew to their ships. Japanese samurai (trained warriors who served lords) fought hard, and after 1274 the government built a stone wall along the shore of Hakata Bay. In 1281 they could not break through, and while their ships waited offshore, a powerful storm (a typhoon) wrecked much of the fleet. Japanese later called such storms kamikaze, "divine wind." Horses and cavalry skills that won battles on the steppe were of little use on crowded ships and walled beaches.

Why a "feudal" system persisted. Japan was ruled by the Kamakura shogunate, a warrior government headed by a military leader called the shogun, while the emperor remained a respected figure with little power. Lords held land and received loyalty and military service from samurai, who in turn expected rewards. Historians often call this arrangement feudal, a term first used to describe medieval Europe; it fits Japan only roughly, since Japan's lands, laws and loyalties differed from Europe's, and some historians prefer other terms. Because the Mongols failed, Japan was never ruled by them, and its warrior system continued. The victory had a price, however. A defensive war won no new land, so the shogunate could not reward many samurai as they expected, and paying for coastal guards strained it. The Kamakura shogunate fell in 1333, but another shogunate replaced it, and warrior rule continued for centuries.

A fully worked model: explaining the whole statement with maps. Step 1: use the map sequence (about 1227 to 1279) to show that the Mongols, united under Chinggis Khan in 1206, had conquered much of Asia by 1279. Step 2: point to China, fully shaded on the 1279 map, as one Yuan state. Step 3: point to Korea, shaded as a dependent kingdom rather than a province, and explain that Goryeo's government survived, lost some northern land and Jeju for a time, and that Joseon later built a strongly centralized state. Step 4: point to Japan, never shaded, and use a physical map of the Korea Strait and Hakata Bay to explain why. Step 5: connect the unshaded map to the survival of the shogunate and samurai system.

The misconception. Students often think the Mongols united Korea for the first time, or that "the storms alone" saved Japan. Korea was unified by Goryeo in the 900s; its royal government survived Mongol domination, though it lost some land for a time. Japan's defense combined the sea crossing, storms, the Hakata Bay wall and determined samurai.

Worked example 1 — read a map sequence: Task: use the map-sequence table in this lesson, which records what three maps of about 1227, about 1259 and 1279 shade. What changes, and what does the change show? Solution: read down each column, then across each row. From 1227 to 1259 the Rus' lands, Persia and Iraq, change from "not ruled" to "ruled," northern China changes from "partly ruled" to "ruled," and Korea changes from "not ruled" to "invaded": the shading grows west into Persia and the Rus' lands and east to Korea, showing rapid expansion by horse-mounted armies across open steppe and plain. From 1259 to 1279 the only row that changes from "not ruled" to "ruled" is southern China, showing the conquest of the Southern Song, while Korea becomes a dependent kingdom and Japan stays unshaded on all three maps. The 1279 column divides the shading into four khanates, showing that the empire was large but no longer ruled by one khan. Time span: 1279 − 1206 = 73 years from Chinggis Khan's proclamation to the conquest of the Southern Song.

Worked example 2 — draw and read a route model of exchange: Task: use the route model in this lesson (Dadu, northwestern China, Central Asia, Tabriz, the Black Sea, with yam stations) to sketch a route map, then explain what it shows about interaction. Solution: draw one line through the five stops from east to west and mark yam stations as dots along it. Add a legend with two kinds of symbols: product symbols (a bolt of silk and a porcelain bowl with arrows pointing west; a horse with an arrow pointing east) and idea symbols (a printed page and a gunpowder bomb with arrows pointing west; a star for Persian astronomy with an arrow pointing east). Read it: the line shows that Mongol rule linked East Asia with Southwest Asia and the Black Sea; the dots show that relay stations made regular travel and messages possible; the arrows show products and ideas moving in both directions. Then state a limit: a route map shows where things could travel, not how much moved or who used it. Many historians think the plague that reached the Mediterranean in the 1340s also moved along routes like this one, but the map alone cannot prove it.

Worked example 3 — use a map of the 1281 invasion (compare the diagram in this lesson): Task: a map shows one fleet sailing from Korea past Tsushima and Iki and a second fleet from southern China, both aiming at northern Kyushu near Hakata Bay, with a line along the shore marked "stone wall." Explain how geography influenced the result. Solution: the sea crossing meant the invaders had to arrive by ship, which limited the use of cavalry and made the fleet depend on weather. The shoreline wall blocked landings, so ships stayed at sea longer, and a typhoon wrecked many of them. The Mongols' greatest strength, horses on open land, did not fit this geography. Japan stayed independent, and its warrior government continued.

Three-map storyboard (representation task): On an outline map of Asia, use the map-sequence table to draw three colored boundaries labeled "about 1227," "about 1259" and "1279" to show Mongol-ruled lands. Add the Korea Strait, Tsushima, Iki and Hakata Bay. Draw the exchange route from the route model with arrows, and add at least one product symbol and one idea symbol for each direction. Beside China, Korea and Japan, write one sentence each describing what the map shows about that place in 1279.

Independent performance: Write a 250–350 word explanation titled "What the maps show about the Mongols in East Asia." Success criteria: (1) you use a map sequence to describe Mongol expansion with at least two dates; (2) you explain how China was reunited under the Yuan and name 1271 and 1279; (3) you explain accurately that Goryeo was already unified, survived under Mongol overlordship and was followed by the centralized Joseon state in 1392; (4) you use geography (the sea crossing, the storm and the Hakata Bay wall) and samurai defense to explain why Japan was not conquered and why its warrior system persisted; (5) you describe at least one product and one idea exchanged across the Mongol empire and name the map feature that shows it.