Good article about a typical hard-working immigrant living below his means.
I've met lots of these types of people, some with much more amazing stories than this guy. The common theme with all these people is that they started with practically nothing, lived below their means, made some sacrifices, had strong family ties, and that they wanted to make sure they had enough wealth so they would never go back to being poor again.
Sometimes, having nothing and being poor gives you the fire-in-the-belly mentality that it takes to achieve your goals. Much of middle-class America lacks that fire-in-the-belly.