Why did china feel a need to be separated from Mongolia?

China's desire to separate from Mongolia stemmed from historical, cultural, and political factors. After the fall of the Qing Dynasty in the early 20th century, Mongolia declared independence, seeking to assert its national identity distinct from Chinese rule, which was associated with Imperialism and foreign dominance. The geopolitical landscape, particularly during the Cold War, further motivated China to assert its sovereignty and territorial integrity, leading to tensions over Mongolia's independence and its alignment with the Soviet Union. Ultimately, China's emphasis on maintaining control over its borders and ethnic territories played a significant role in its approach toward Mongolia.