New immigrants must prove that they won't be a burden before they are allowed to enter the United States. Compared to the native-born population, immigrants are more likely to be employed, save more of their earnings, and are more likely to start new businesses. Immigrants have a slightly higher per capita income than natives and a slightly lower household income. Non-refugee immigrants of working age are less prone to welfare than natives. Immigrants aren't really interested in becoming part of American society.
Evidence points to the contrary.
Immigrants are very interested in being part of our society. First and second generation immigrants are assimilating so quickly that their parents and grandparents fear a total loss of their native culture. Immigrants want to learn and speak English. Reports from throughout the United States indicate that the demand for classes in English as a Second Language far outstrips supply. The children of immigrants, although bilingual, prefer English to their native tongue at astounding rates.