You mean like the Somalis, Haitians or the Chinese women that fly here to give birth to anchor babies?
America is great because we have something called "western civilization".
The issue is that "we" have allowed people to come here that will not assimilate to western culture. There are groups that come here to take advantage of American generosity and compassion.
These same groups hate America, hate western civilization, and want to change the American way of life.
You want to see something amazing, check out how much money flows out of the United States through "remittances" to other countries.
These are immigrants that make money here, but send it to their "mother country"
Research how many dollars are sent back to central and south America, and the Philippines.
These remittances actually are the major contributors to these nations GDP.
The wealth is leaving the USA.