Answer: they undermined feudalism, they lost a lot of money in the wars
Explanation:
The fall of the Roman Empire begin in the medieval age. The medieval age brought the plagues, famines, diseases and in the middle of it all is feudalism. Feudalism or the feudal system was a dominant social system used in western mainly from the 5th to 11th century. In feudal system land are rewarded to lower classes for services, military services and loyalty.
There were several ways in which the US government increased Mexican immigration, but the best option is "congress passed laws saying that all Latinos fleeing dictators are welcome"