HAHA....the US has illegal immigrants who live and work here for generations. You wouldn't have a bit of problems.
I think the US advantage, and perhaps the same is true in South Africa...don't know.....but we have a vast amount of land which isn't even developed. I live in a city of 1.8 million people and they decided we needed more room. They simply began to develop hundreds of acres they had on the outskirts by building a ton of office parks, condos and a European style mall. People are moving in there by the hundreds daily.
I can drive to my parents house and go 50 miles without seeing a house or any development. And this is Florida which is considered a well populated state.