What happened in Mao Tse-tungs life in 1919 that propelled him into politics?

In 1919, Mao Tse-tung became significantly involved in political activism during the May Fourth Movement, which was a response to the Treaty of Versailles and the perceived betrayal of Chinese sovereignty. This movement galvanized student protests against foreign Imperialism and promoted nationalism and reform. Mao's participation helped him develop his political ideology and connections, ultimately leading him to become a key figure in the founding of the Chinese Communist Party in 1921. This year marked a turning point in his life, steering him towards a lifelong commitment to political leadership and revolutionary change in China.