It did so in 1777 and remained one until it joined the Union in 1791.
1921
South Carolina succeeded in seceding first.
It became independent in 1922 and declared itself as a republic in 1948.
China itself is just a region. The countries are the People's Republic of China and, if you agree, the Republic of China (Taiwan).
Taiwan
Haiti is an independent republic. It controls itself.
1776
NOvaNet---England
Great Britain
Republic of California
Err... Great Britain?
Vermont separated from Massachusetts in 1777 when it declared its independence and became an independent republic. This separation was formalized after the American Revolutionary War, as Vermont sought to establish itself as a separate entity due to disputes over land claims and governance. Vermont was later admitted to the United States as the 14th state on March 4, 1791.
1921
Great Britain on the 4th of July 1776.
South Carolina succeeded in seceding first.
No colony. The Green Mountain Boys were from Vermont which was recognized by the British crown as a part of the New York colony. They were a militia formed to protect Vermont from the territorial ambitions of New York and to keep Vermont separate from New York. Vermont later declared itself an independent republic, and after the thirteen colonies became the first thirteen states, Vermont joined the Union as the fourteenth state, but it was never recognized by the British as a colony, and the Vermonters did not recognize themselves as New Yorkers.
It became independent in 1922 and declared itself as a republic in 1948.