Answer:
Option: A. The Treaty of Guadalupe Hidalgo gave the Unites States vast Mexican territories and set the southern boundary.
Step-by-step explanation:
The Treaty of Guadalupe Hidalgo was approved in 1848, concluded the war between Mexico and the United States. The Treaty provided a large part of Mexican territories to go under the United States in negotiation for 15 million dollars. Mexico gave all its major territories and acknowledged the Rio Grande as the southern boundary of America.