You can't.
I am not being defeatist but just going on purely practical numbers you can not.
When you have one family move into an area they accommodate to the local culture. They might add something but mostly their kids become locals. When you get to 10% of an area is imports they do not accommodate to the culture, they isolate and demand that the culture accommodate them.
Why Haven't the Locals Integrated?
This is in the UK but it does not matter. It is every where.
Once I was only against illegal aliens coming to this country. Now I am swinging toward the idea that we are going to have to reduce immigration to almost zero for at least a couple of decades if we want our culture to live.
Even if we deport 90% of those here illegally we have a serious problem with a cultural dilution that may be fatal.
The American Culture is unique in the world. I for one do not want to see it vanish.
I know what you’re saying, but there is no other choice if America is going to survive.
I personally think it may be too late myself, but it’s all one can do.