...that all men are created equal, that they are endowed by their Creator with certain unalienable Rights, that among these are Life, Liberty and the pursuit of Happiness. ~ United States Declaration of Independence
That's it in a nutshell, isn't it? The United States of America isn't perfect, but the foresight of our founding fathers and the framework they developed for our government is amazing. They even built in a way to smooth out the flaws.
They obviously did something right... even after all this time, there are more people trying to get into the country than out, right?
My God! How little do my countrymen know what precious blessings they are in possession of, and which no other people on earth enjoy! ~ Thomas Jefferson