Why didn't the Chinese establish their own country in Southeast Asia? How did these seven China countries perish?

While western Europeans colonized vast areas of Asia, Africa and Latin America, people began to move towards South Asia. In the middle and late Ming Dynasty, Han people began to immigrate to Southeast Asia on a large scale, which was called "going to Southeast Asia" in history. China people immigrated to Southeast Asia, which brought advanced production technology and sufficient labor force to the local area. China people opened up a new world in the wild land with their own hands.

In fact, Singapore was not prepared to establish its own country at first. Singapore actively joined the Malaysian Federation. Later, due to the contradiction between the People's Action Party led by Lee Kuan Yew and the Malay National Unity Organization of Malaysia, and the riots between Chinese and Malays in Singapore, Tengku, the leader of the Malay National Unity Organization, expelled Singapore from Malaysia to avoid further deterioration of the situation. Singapore's expulsion from Malaysia was passive, not active.