They did so because they wanted to be allies with Europeans. You would be at a bigger advantage with more countries on your side.
China had become communist in 1949 and communists were in control of North Vietnam. The USA was afraid that communism would spread to South Vietnam and then the rest of Asia. It decided to send money, supplies and military advisers to help South Vietnamese Government.
The answer is C. Property rights
It’s not A because it says nothing about where he bought the goose, and it’s not D because he doesn’t offer to help track down the location so it’s either b or c. I think it’s B but I don’t know what happened before this.
The French and Indian War pitted the colonies of British America against those of New France, each side supported by military units from the parent country and by American Indian allies. 1754 – 1763