There was only America . It was the Northern States against the Southern States of the U.S.
union(north), confederates(south)
Countries were not fighting in the War of the Roses. It was a civil war between two royal houses, Lancaster and York. They were fighting over the crown. One complication: the War of the Roses occurred while England was involved in the 100 Years War with France.
The Civil War was a between the Union (North) and the Confederacy (South) in the United States. No two countries were fighting against each other. That's why it was called a civil war because it was a war between two sides in one country.
No countries are fighting over Switzerland. Switzerland is at peace with all its neighbours.
The two countries fighting during Pearl Harbor were the Imperial Japanese Navy and the United States Navy
The Battle of Bull Run was fought during the Civil War - North vs. South
North and South!
North & South Korea
India and Pakistan
The Northern States and the Southern States!
It wasn't plain and simple. It was not two groups of one country fighting, it was an invasion of a nation by another.
Spain and the US.