What is 2 to 3 factors that contributed to the growth of European imperialism and two to three effects it had on the world

Various motives prompt empires to seek to expand their rule over other countries or territories. These include economic, exploratory, ethnocentric, political, and religious motives. Economic: Imperial governments, and/or private companies under those governments, sought ways to maximize profits. Industrialization and competition with Europe for power were factors that contributed to the growth of European imperialism. The effects of these factors were that they were able to use weaker nations to meet their commercial needs and if they had many colonies they would be grow to be richer and powerful.

Japan  sided with the  entente powers  in wwi because it was a great opportunity to pick off germany's colonies in the pacific free of charge.