Why Did Japan Enter World War 2

Argument:
The main cause of Japan joining World War 2 is because they wanted to expand their territory.

Short Background of Japan's involvement in WWII (500 words):

Japan participated in World War 2 and was part of the Axis Powers. Before World War 2, Japan had struggled and wanted to expand their territory. There are many reasons for this, one of which was to establish itself and gain equality with the Western Powers. Japan wanted to be considered as an equal amongst the Western powers which had conquered and controlled large territories and colonized different countries. Other reasons include rapid population increase, lack of land for housing and farming and the economic crisis due to the Great Depression in 1929.

The military-ruled government then decided to have an expansionist foreign policy to take control of territories near Japan. Their justification for this was that it was necessary in order to support their supply or raw materials and resources.
The League of Nations were ineffective in stopping Japan from invading Manchuria and took no action and Japan seized the opportunity to invade the rest of China just six years later, and this can be considered to initiate WWII in the Pacific region. Their undying desire of expanding their territory and being the most powerful empire in the region caused them to challenge the most dominant country in the region of that time.

Japan signed the Tripartite Pact in 27 September 1940 with Italy and Germany. This is the date that Japan was considered to be part of the Axis Powers, slightly over a year after the official start of World War