Should immigration be restricted or should it be open to anyone who can get here? From 1492 until the 20th century, anyone who could get here was allowed entry and could become an American. The immigrants, primarily Europeans, brought their own cultures, languages and religions into the melting pot, but made no efforts to assimilate with the Native Americans. Ask the tribes how that turned out.
A few years after World War II, as a young child, I immigrated to the U.S. The screening process for my parents was thorough and lengthy. We became Americans. Those who seek political, religious and economic freedom should be welcomed, and those who seek to forcibly impose their cultures should be excluded.