Was it the north or south that won the american ...

The north or the regular and legitimate government of the U.S. defeated the southern or secessionist states and thus preserved the Union.

The north (the union) won the war. The southern general Robert E. Lee, commander of the confederate (south) army, surrendered his army to Ulysses S. Grant, commander of the union army, on April 9, 1865.

For more, check this Wikipedia entry. 

The North.

Slavery was supposedly abolished and Southern States joined the Union. But, African Americans didn't really enjoy equal rights till much later (and not necessarily enjoy all the privileges Caucasians do today), casualties and wounded numbers were enormous for both sides, and even today in the South you will hear references to "The War Between the States" rather than the Civil War, indicating their sense of separateness.

uhm..are you retarded? how did you get through any education not knowing this.