Why This Immigrant Opposes Open Borders And Unchecked Mass Migration

I am an immigrant and a naturalized citizen. I came to this country at the age of ten, grew up in a blue-collar immigrant household, was raised around primarily Central-Eastern European and Hispanic working-class immigrants, and ultimately married another immigrant. So, according to the left, I represent a demographic that should support open borders and unchecked mass immigration (both legal and illegal), both out of self-interest and for moral reasons. I see things differently, however, and opt for national sovereignty, secure borders and common-sense immigration policies that benefit the United States and its people.