== == In all conflicts some powers stay neutral. Generally it was because the neutral nation saw no need to get involved. Wars are costly in money and usually bloody. They can lead to destabilizing conditions for all involved parties, even victors. As such, a wise national leader will consider all options before resorting to war.
They wanted to stay neutral-out of the war
They just didn't pick a side to fight for.
because they had to back up other countries when they got in war
Yes they did.
yes
Switzerland was neither in the Axis or the Allies during World War 2. Switzerland wanted to stay completely neutral. And to stay neutral, they would shot any planes that belonged to the Allies and Axis Powers that flew over Switzerland,
yes
America is a large country whose people have many different opinions. Some Americans believed that America could remain neutral during World War 1, some believed that America could but should not stay neutral, and some believed that America could not stay neutral. Initially, those in favor of neutrality were the vast majority. Eventually those supporting participation in the war became a larger and larger fraction of the population, until they were so large that a declaration of war became politically possible.
They didn't want war. They wanted to stay neutral so they could lose as little lives as possible.
Switzerland declared itself neutral. And billions of dollars were stored in Swiss banks belonging to both Allied and Axis countries. All tacitly agreed to leave Switzerland alone, obviously.
They didn't. They entered late, In 1917
To stay neutral and not get involved.