The Axis powers (also known as the Axis alliance, Axis nations, Axis countries, or just the Axis) comprised the countries that were opposed to the Allies during World War II. The three major Axis powers—Germany, Japan, and Italy—were part of a military alliance on the signing of the Tripartite Pact in September 1940, which officially founded the Axis powers. At their zenith, the Axis powers ruled empires that dominated large parts of Europe, Africa, East and Southeast Asia and the Pacific Ocean, but World War II ended with their total defeat. Like the Allies, membership of the Axis was fluid, and some nations entered and later left the Axis during the course of the war.
Germany is the only nation that starts in the Axis and must influence or have other nations drift into its corner of the triangle.
These are some of the most likely candidates for this faction.
Axis nations have the ability to declare a limited war, which means your faction members are not called to participate. However, you can issue a "Call to Arms" at a later time if you wish.