Let me preface this by stating that I cannot speak with any authority on areas outside the United States and Europe, maybe someone can jump in and expound on my response. Excluding slaves and indentured servants, the United States was a fairly egalitarian society when compared with the rest of the world. The wealth of men like Hancock, one of the richest men in the colonies during the revolutionary period, paled in comparison to the aristocracy in Europe. Land in the new world was cheap, fertile, and abundant. Favorable trade status with the British meant there was always a market for their raw materials and cash crops. Most of the very poor came to America by way of indentured servitude, in which they would trade a number of years as what was essentially a slave, in exchange for passage to the new world and the opportunity to apprentice with a master. This system meant that a large portion of the influx of unskilled laborers to the new world would be provided lodging, food, and skills in order to get themselves on their feet.

The American people also had a great deal of political wealth when compared to those across the Atlantic. America enjoyed one of the highest (I think it was the highest but I'm having difficulty coming up with a source) literacy rates in the world, and the distance from the English crown meant that self government became more of a fact of life than a coherent political philosophy.