Final answer:
The Xianbei, specifically the Tuoba clan, founded the Northern Wei dynasty in 386 CE.
Step-by-step explanation:
The Inner Asian Steppe people who founded the Northern Wei dynasty were the Xianbei. The Tuoba clan, a branch of the Xianbei, established the Northern Wei dynasty around 386 CE. This dynasty experienced a period of significant cultural exchange between the Xianbei and Han Chinese, particularly under the reign of Emperor Xiaowen. However, the infusion of Chinese customs and traditions led to internal strife, resulting in rebellions by the Xianbei warriors stationed on the frontiers and ultimately contributing to the dynasty's downfall.