B. it Pitted Communism against democracy
Unconquered China put his eastern territories at risk. From the Mongols.
The correct answer is the US senate, and president Wilson pushed in favour of the two. A possible reason for senate's rejection was a conflict with the president. Another possible reason was that the senators feared this would threaten the independence of the US.
Half of the US would be part of Mexico, Texas was the first Mexican territory to become part of the US so the rest weren't hard to get since Texas was so big. I personally wish Texas would've stayed because if it would've, Mexico, my country, would be as powerful as the US.
BUT NAHHHHHHHHHHHH