This conflict was a proxy war in that the warring groups each received substantial support from either communist countries or western democracies. The conflict started with a communist invasion from the north, eventually supported by the Chinese. This invasion was driven back by the southern forces, with support from the United States and the United Nations. This conflict ended in an armistice, but no official peace agreement has been negotiated.

Which of the following does the above paragraph relate to?
The Vietnam War
The Korean War
The Cambodian Civil War
The Salvadoran Civil War