Kamala opens by kicking Trumps ass, page-643

Reducing the flow of illegal immigrants will take some pressure off of their (pitiful) social security costs.
It will also help to reduce the US carbon footprint as a bigger population requires more energy to sustain.
Take some pressure off of their aging infrastructure.
Reduce unemployment.
Reduce crime (hopefully).
Lower housing stress.

There a few just off the top of my head.