A Green Card is for Permanent Residency...leading to US citizenship after 7 years...if the person wishes to become an American. Many folks who get American citizenship that way end up dual citizens of the US and of their home country.
Sometimes the poor immigrants have to go to Catholic Charities to get a free hot lunch, because their millionaire employer does not want to give them more money, because he needs to buy another yacht.
That was by force. They had no choice. The illegals now have a choice. Plus are you to compare the great acts of our founding fathers to people living on welfare?