Long ago, a group called the Mongols grew very strong. They moved into China. They met many different groups of people. Some people joined them to help. This changed China forever. Can you imagine a new king?
Long ago, the Mongols became very strong. A leader named Genghis Khan led them. He wanted to rule many lands. The Mongols moved into China. They fought many different groups. 

The Mongol conquest of China was a long series of wars. It lasted for 74 years. It began with Genghis Khan. He was a powerful Mongol leader.
First, the Mongols fought the Western Xia. Genghis Khan led raids into their lands in 1205. Later, he tried to flood their capital with a river. The Western Xia ruler surrendered. He gave his daughter to Genghis in marriage. But later, the Western Xia fought the Mongols again. This led to more war. In 1227, Genghis Khan died. His death was kept a secret to keep the war going. The Western Xia state was eventually destroyed.
Next, the Mongols fought the Jin dynasty. 
The Mongol conquest of China was a huge series of military efforts. These wars lasted for 74 years, from 1205 to 1279. During this time, the Mongol Empire fought many different groups. They defeated the Jin dynasty and the Western Xia. They also conquered the Western Liao, Tibet, and the Dali Kingdom. Finally, they defeated the Southern Song. This long struggle changed the history of the whole region. It was the first time non-Han people ruled all of China.
To take over these lands, the Mongols used many different ways. At first, they used small raids to attack border areas. Later, they learned how to take down big cities with walls. 
This massive conquest began with a leader named Genghis Khan. In the early 1200s, he was busy building power in Mongolia. He was formally named Genghis Khan in 1206. He started his campaigns against the Western Xia in 1205. He also led raids into the Ordo region in 1207. The Mongols fought many battles to gain control of the land. Even after Genghis Khan died in 1227, the work continued. His death was kept a secret so the army could keep fighting.
Many specific people and groups helped shape these years. The Western Xia emperor, Li Anquan, once surrendered to Genghis Khan. He gave his daughter, Chaka, to Genghis in marriage. Later, the Han Chinese general Shi Tianze helped the Mongols. He led troops against the Jin dynasty. 
This era connects many different parts of Chinese history together. It shows how different empires like the Jin and Song were replaced. In 1279, the Mongol ruler Kublai Khan started the Yuan dynasty. This new dynasty followed Chinese traditions. It marked the moment when China was unified under Mongol rule. This period also saw Tibet joined with the rest of China. It was a time of great change for everyone living there.
The Mongol conquest of China was a massive series of military campaigns. These efforts lasted for 74 years, from 1205 to 1279. The Mongol Empire fought several different ruling powers during this time. They defeated the Jin dynasty, the Western Liao, and the Western Xia. They also conquered Tibet, the Dali Kingdom, and the Southern Song. This long period of conflict eventually led to the reunification of China. It was the first time that non-Han people ruled the entire country. It also marked the first time Tibet was unified with the rest of China.
The conquest began with small-scale raids into Western Xia in 1205 and 1207. These early attacks were led by Temujin, who was later known as Genghis Khan. In 1206, he was formally proclaimed Genghis Khan, the ruler of all Mongols. One major goal for Genghis Khan was to conquer the Jin dynasty. He wanted to avenge the death of a previous Mongol Khan. He also sought the riches of northern China. To do this, he had to transform his army. The Mongols were originally great riders, but they were not experts at siege warfare. Siege warfare is the method of attacking fortified cities with walls.
To overcome city walls, the Mongols worked with Chinese engineers. These specialists helped the Mongols develop new techniques for taking down fortifications. This training made Mongol troops some of the most successful besiegers in history. 
The conflict with the Western Xia was particularly intense. In 1209, Genghis Khan besieged the capital city of Yinchuan. The city had a garrison of 150,000 people. The Mongols tried to build a dike to flood the city with the Yellow River. However, the dike broke and flooded the Mongol camp instead. Emperor Li Anquan eventually surrendered to Genghis Khan. He gave his daughter, Chaka, to Genghis in marriage as a sign of loyalty. For a few years, the Western Xia served as loyal vassals to the Mongols. However, they later refused to help Genghis Khan in his campaign against the Khwarazmian dynasty. This betrayal led to a massive Mongol retaliation in 1225.
Genghis Khan attacked Western Xia with a force of about 180,000 men. He ordered his generals to destroy cities and garrisons as they advanced. In 1226, Mongol troops reached the city of Wuwei, which surrendered to avoid destruction. Later that year, the Mongols fought the Battle of the Yellow River. In this battle, they destroyed a Western Xia force of 300,000 people. Genghis Khan returned to besiege Yinchuan in 1227. During the siege, Genghis Khan died of an uncertain cause. To keep the campaign going, his death was kept a secret. In September 1227, the Western Xia emperor surrendered and was executed. The Mongols then destroyed the city of Yinchuan and the Western Xia state.
The fight against the Jin dynasty lasted many years. Genghis Khan reached the Great Wall by 1213. In 1215, the Mongols captured the Jin capital of Yanjing, which is modern-day Beijing. 
The conquest ended with the rise of the Yuan dynasty. In 1279, the Mongol ruler Kublai Khan established this dynasty. He had defeated the last resistance from the Southern Song dynasty. This victory completed the reunification of China under Mongol rule. The Mongols showed they valued certain professionals during their rule. They ordered that physicians, craftsmen, and religious clerics be spared from death. This era changed how different cultures and systems interacted in East Asia. It connected the Mongol traditions with the established structures of China.
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