With your wisdom, perhaps you could explain why we need continued immigration.
Reason 1: You can't stop all immigration. To think otherwise is to live in a fantasy world.
Reason 2: It gives citizens a solid legal and moral foundation to oppose illegals, because there is a legal alternative, and we believe in the rule of law in this country.
Reason 3: Legal immigrants tend to be good, upstanding, self-supporting citizens who are GRATEFUL to be citizens and who LOVE the USA. They are here because they WANT to be Americans, not just because they were blessed to be born here. (Many of us are both, but many are not.) We WANT more citizens like that.
If you believe immigration is harmful to the country, feel free to lead the way and take yourself along with all your relatives and leave. After all, that's how YOU got here.