Question

which country formed the group of powers known as axis power

Answer 1

Italy joined the Pact in 1937. The "Rome–Berlin Axis" became a military alliance in 1939 under the so-called "Pact of Steel", with the Tripartite Pact of 1940 leading to the integration of the military aims of Germany, Italy and Japan.

Answer 2

Germany ,Italy,and Japan formed this group known as Axis Powers to war with Allied Powers