The main motivation was GOLD. but if you need more options EXPANSION OF TERRITORY would work too. Have a good day, Hope this helps:)
You can find all your answers about this here https://www.thoughtco.com/world-war-i-the-fourteen-points-2361398
To people in tokyo its mportant to know that its how japan attacked china and tokyo made a change
WE needed some supplies. Also' we produced so much that it was going to waist more than anyone could consume it. Thats when we started to get involved becuase we needed things so we traded with each other for goods.
The age of the universe, the identity of quasars, and the existence of dark energy.