What japan become and imperial power

Need on these last 2 questions on my social studies homework 5 and 6 then i’m done with the homework

What role and side did italy fight on during world war 1? why did they change sides? write this in your own words.

Synthesizing new ideas from a speaker with what one already knows about the subject to see if the information makes sense is an example of a.questioning and challenging b.identifying differences c. forming a statement d.seeing the boader context