Answer:
The U.S., technically
Explanation:
By every traditional measure, the United States “won” the Vietnam War. U.S. troops moved with impunity and held the field of battle after almost every engagement. Casualty rates were extremely lopsided in America's favor. Yet, by 1976, South Vietnam, Laos and Cambodia were communist. Which means that Vietnam won, if you will.
So I guess the U.S. won every battle and still lost the war. The war ended with a cease-fire rather than a peace treaty.
1865, Jan.
United States House of Representatives passed the joint resolution proposing a thirteenth constitutional amendment abolishing slavery, which the Senate had passed in April 1864.