Question

Which territory did the United States gain from the Treaty of Guadalupe Hidalgo?
A) Florida and Louisiana
B) California and New Mexico
C) Utah and Oregon
D) Kansas and Nebraska

Answer 1

B. California and New Mexico.

(Even Utah, but that's another question)

Answer 2

Mainly California and New Mexico. Although they also gained parts parts of other states such as, Utah, Nevada, Arizona

So, B seems like the best answer.