Walls (fixed fortifications) can only do so much. Just like the French Maginot line, the Germans went around it to invade France. Easy-peasy-Japanesy.
The real "wall" happens by not allowing illegals once here to defraud our system through their anchor babies for billion of dollars in welfare, entitlements, free healthcare, free education, free food, etc. So, of course they will find a way in, especially where there are ZERO disincentives to their illegal act of coming here. One thing that must happen is anyone who has used a fake/stolen social security number should be immediately convicted of a felony, deported, and that person NEVER allowed back in.
We need a national ID, and nobody who is here who can't prove legal residency should be able to drive a car, use healthcare, put a kid in school, rent an apartment, nothing. Some nations are like that. You sneak in and then try to disapear into the country and then find a job or rent an apartment, and you are fleshed out.
And another thing; just like people who complain about cartels and drug crime, but who are recreational users created the market and the cartels, the same goes for illegal alien workers. So, every one of you who hires a nanny, a housekeeper, a gardener, a painter, or who has your car washed at a car wash, or occasionally eats at a taco truck. YOU are all contributing to the economic incentive for these illegals to come here when you FAIL to question or consider that most of those workers are illegal aliens. A good start is to mow your own lawn, wash your own car, and clean your own house. Especially when YOU KNOW that below minimum wage worker giving you such a great deal is probably illegal. People who hire illegals have to room to complain about people coming across the border.
Lastly, birth right citizenship is about as dumb as putting your own gun to your own head. We have allowed our nation and culture to be destroyed by open borders.