OMG the open border is permanently damaging and changing the demographics of thr USA FOR THE WORSE!!!! Get real!!! It is THE issue of our time.
We are already damaged. Our national debt/our GDP ratio is higher than any country except perhaps Japan. You are assuming all illegals are lazy and will feed at the welfare trough. Many will of course, but immigrants start more small businesses than native born Americans based on population size. Every category of immigrant ethnicity earns more than US born White Americans on average. You can not do that unless you are working hard. Welfare is generous but not that generous.
Having said all that, I am strongly against unvetted illegal invaders. If I was the king of United States, I would build a 100 foot high wall topped with toxic broken glass on borders and deport every illegal.