When did Italy join the Axis powers?

Answer 1

Originally hoping to have their chance at the spoils of war, Italy agreed to fight on the side of the Axis forces and moved into North Africa. Allied powers entered North Africa in August of 1942 and reached Sicily by August 1943. The following month, Italian Leaders surrenders to the Allied forces. October 13, 1943. After strategic and military conditions deteriorated, Italy, along with several other nations, changed sides and declared war on the Axis Powers.

Answer 2

On November 1, 1936, Germany and Italy, reflecting their common interest in destabilizing the European order, announced a Rome-Berlin Axis one week after signing a treaty of friendship. Nearly a month later, on November 25, 1936, Nazi Germany and Imperial Japan signed the so-called Anti-Comintern Pact directed at the Soviet Union. Italy joined the Anti-Comintern Pact on November 6, 1937. On May 22, 1939, Germany and Italy signed the so-called Pact of Steel, formalizing the Axis alliance with military provisions. Finally, on September 27, 1940, Germany, Italy, and Japan signed the Tripartite Pact, which became known as the Axis alliance

Source: http://www.ushmm.org/wlc/en/article.php?ModuleId=10005177

Answer 3

In 1936 Germany and Japan signed the Anti-Comintern Pact, and Italy joined the year after. In 1940 the three countries signed the Tripartite Pact, officially making the three formal allies.