The United States of America certainly is "The Land of Opportunity."
In my case, for example, I grew up in a very impoverished household; however, by the time I was in my mid-20's, I had a college degree, a profession, and I was financially secure.
And all of that happened because, in the U.S.A., there are unlimited opportunities for those individuals who are willing to work as hard as they can and to "walk the extra mile."
Furthermore, there are literally millions of stories like mine.
In fact, as I type this answer, a considerable number of U.S. inhabitants are in the process of advancing in life and improving their strata in a wide variety of ways.
I repeat, the United States of America certainly is "The Land of Opportunity."