it never did.
Because it was Wilson's idea for the League of Nations, and if the US didn't join why should Japan. They had no actual reason to if even the own creator of the whole idea didn't join.
Allied powers* because they were attacked by Japan.
The US and Japan went into war after the Japanese bombed and attack Pearl Harbor. A naval base in Hawaii. This forced America into war with Japan and to join WWI.
Japan attacked us at Pearl Harbor, Hawaii
December 7th, 1941 was the date that Japan attacked Pearl Harbor. The US declared war immediately.
Japan bombed Pearl Harbour
Japan bombed Pearl Harbor and that's when the US declared that they would join WW2.
Dec 8,1941, after Japan attacked the US. But we pretty much helped them all along.
Japan they attacked pearl harbor
Japan did not join the Central powers, it joined the allied powers.
The bombing of Pearl Harbor and Japan was the one to place the bomb.
Japan had early alliances with Germany. They were promised the Pacific Island holdings of the US if the Axis powers won the war.