
Because, They don't have another money, or people doesn't really care about them. The poor have struggles to have medical attention how they life style is like. It's hard for them to get enough medical attention, and, that's why sometimes people need to donation some money that the poor can get food, fresh water, medicine they need. Sometimes when people try to help Mother Nature comes in.. and, ruin everything. Soooo... yeah.
Hopefully, this helps you!!

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.
The migration is known as "<span>Za Chlebem", which in English language is translated as "For Bread".
As it is obvious from the name that this migration was in search of a better life, it mainly consisted those Polish immigrants who in Poland had no basics of lives neither did they own any land to support themselves.</span>