What is the average income of Americans?

Asking Americans

Hello, I'm from Brazil and I'm interested to know about wages specifically in the US. What is the average wage where you come from? Does it differ consistently from state to state? From big-city to small-town? Does it change consistently from the sector where you are? For example, does industry pay well back there? I'm curious because I've heard that the AVERAGE income earned by americana is approximately U$4,000 per month which would give U$48,000 per year. Is the US an expensive nation? I'm really curious. Here in my country, the average income is R$2500, which gives in dollars U$400 per month and U$4800 per year.