Because they wanted to have a better life
I believe the answer is: the Root-Takahira Agreement
In the Root-Takahira Agreement, The united states government agreed to let go of American influence in China and not intervene in Japanese's effort to invade China. In return, the Japanese government had to hand over Philippines' territory to united states.
They didn't want to be involved in any (foreign) wars that didn't have anything to do with the United States.
Hopefully this has helped!
They bring people together to achieve control of thr government,develop policies favorable to their interests or the groups that support them.They also organize and persuade voters to elect their candidates to office.