Question

In the 1920s and 1930s, the Japanese invaded surrounding territories MAINLY because

Answer 1

In the 1920s and 1930s, the Japanese invaded surrounding territories mainly because they "needed natural resources" to fuel their domestic growth, since Japan is a very small island and lacks many of these necessary resources. 

Answer 2

Japan was growing at a fast rate and their small country was running out of natural resources so they invaded other countries to use those land's natural resources.