Because the amount of human death
The USA intervention in Mexican Territory , referred as the The USA intervention in Mexican Territory, referred as the Mexican-American War, was an armed conflict between Mexico and the USA between 1846 and 1848. It was caused by the expanding urge of the USA to the south; the first step was the creation of the so called Texan Republic, situation that separated the Mexican State of Coahuila and Texas. The other detonators of the war was the demands from the Mexican Government for retribution due to damages caused by the Texan independence War, and the trespassing of North-American forces into Mexican territory.
The answer to this question is:
territory along the southern border of Texas
1920s? Roaring 20s is a good description because of the benefits after WW1, but it also had the early parts of the Great Depression. I would have to go with return to normalcy though, since the question seems like a trick against you. : ) hope it helps!
Answer is A. A journey to the Holy Land