Why has America become so successful compared to most nations on earth?

1. isolation: oceans on two sides of us with only Canada and Mexico on it's borders.
2. almost unlimited natural resources: from trees to water to oil to Gold and other metals with lots of good ground to grow things in, including some of the best land on earth for growing crops and in California with many places that have 4 growing seasons a year (if there is enough water that year).
3. If you trace American government back to the Magna Carta, protestant reform, and parliamentary government in England, and then you watch the way government evolved here in the U.S. and the attitudes people brought to this country from all over the world, you can then see why the U.S. has been so relatively successful compared to most other nations on earth.

4. So, if you think about America being a little like Tibet in it's isolation it could like Tibet develop a really long time without being destroyed over and over again by wars like many countries are around the world through time. So, basically no one has succeeded in attacking us and holding our territories very long since 1776. So, we have developed in ways most nations simply couldn't have because of local dynamics in their areas of the world.

5. Also, one of the strengths of the U.S. is people who come here from all over the world also bring all the strengths of their native cultures which makes the U.S. extremely powerful in a variety of ways.