Answer: b. an invasion by the Mexican army into the southwestern United States
Step-by-step explanation:
Which pushed the United States to go to war against Mexico in 1846?
b. an invasion by the Mexican army into the southwestern United States
- In the year 1846 US went to war against Mexico because of an invasion by the Mexican army into the southwestern United States known today as South Texas
- Mexico lost fifty-five percent of their territories to US