Who is fighting who in World War 2?

In World War II (1939–1945), the conflict was primarily between two major alliances:

Allied Powers

1.United Kingdom

2.Soviet Union (joined in 1941 after Germany invaded)

3.United States (joined in 1941 after Pearl Harbor)

4.China

5.France (Free French Forces after occupation)

Axis Powers:

1.Nazi Germany

2. Fascist Italy (until 1943; switched sides after Mussolini was overthrown)

3. Imperial Japan