What led mongol armies that invaded china?

The Mongol armies that invaded China were driven by several factors, including Genghis Khan's ambition to expand his empire and consolidate power. The desire for wealth, resources, and trade routes also motivated the invasions, as China was seen as a prosperous region. Additionally, internal strife within the Chinese states provided an opportunity for the Mongols to exploit divisions and launch their military campaigns. Ultimately, their superior horse-based tactics and mobility enabled them to achieve significant victories against Chinese forces.