Why do you love the US?
I've traveled to 52 foreign countries and conversationally speak 5 languages. My list of platitudes for the USA is long but I'll just point out that more people want to legally immigrate to the USA than to all other places combined, and now we find out that 22 million have done it illegally so one would wonder why? In a nutshell - opportunity. Opportunity to succeed beyond your wildest expectations and too the opportunity to fail miserably :-} but we give second and third and fourth chances.
Because it's so big. It's faster for me to drive to the middle of Mexico than get out of Texas. Texas is so damn huge I was only able to drive out of state once. Imagine visiting the remaining states?
Russia, Brazil, Australia, and Canada are also huge countries, but they have huge and vast non-populated areas. In the US, pretty much the whole country is populated and habitable.