The American Dream is that if you work hard, make good decisions regarding your health, finances, and future that you will be in a position to some day own a home, and raise children in a safe and positive environment.
Depending on who you ask, it may not relate. Republicans will tell you that the American dream exists to this day and the system is fine and that people are the problem. Those in poverty either did not work hard made poor health or financial decisions (e.g. bought houses they could not afford, had kids before they made enough money to support them, did not buy home owners insurance and lost everything they own, etc.)
Democrats would tell you that the system is broken an the current system is designed to benefit the rich and put more of the lower class into poverty. They suggest a government that promotes wealth distribution (taking from the rich and giving to the poor) The country is essentially split 50/50 on who is right hence the current political environment.
My opinion, is that you can find countless cases, me being one of them of people born after 1980 raised in the lower clase that have found a way to catch the american dream, and in a few short years have been able to buy a house cars, dogs, and raise children. Furthermore. Everone I know who is in poverty, made some very stupid decisions that put them there, or their parents did. I agree with the republicans.
The "American Dream" is owning a house and having a Family with a wife, 2.3 kids and a dog. Lol.
It's the average success that is suppost to be available for all citizens, although in today's world this is becoming harder & harder to achieve due to the economy.