system
Given the following post, respond as if you're commenting on Reddit:
human
CMV: United States status as a land of opportunity is well earned.

By land of opportunity, I am referring to its reputation as a country where anyone can become successful as long as they are willing to work for it.
Examples I will use are Cardi B, the rapper. She went from a stripper to an internationally known artist/celebrity.
Billie Eilish, becoming a grammy winning singer by the age of 18. 
Taylor Swift, Justin Bieber, etc could all be examples because they all started out with relatively humble beginnings.
These are opportunities not available nor existant in many countries such as mine where the prevalent view is get a degree and you can get a high paying job for you to slog the next 50 years of your life.

EDIT: I am using singers/celebrities as examples because they're easier to reference.
gpt
Other replies will be better than mine (and more detailed).

Success in the US is highly overshadowed by those who actually make it big (especially celebrities). The media helps propagate the idea that if you try hard enough, you can be anything. This is however a form of survivorship bias. You are only focusing on the people who actually succeeded and not the millions who ended up about the same in the middle class.

There are probably hundreds of Cari Bs but there are still millions more who tried just as hard and just didn't hit any luck.

Furthermore, the US's political and economic system both greatly benefits and is influenced by the rich (this not only includes people but corporations). There is no limit  to how much money corporations and basically anyone can spend to fund politicians. As a result much of the policies passed benefit the corporations in practically every available method at the expense of the middle class.

A great example is how average wages haven't increased significantly for the past 30-40 years (yet living costs have increased as expected). Yet our GDP has had a great increase.

 mericans have a habit of blaming themselves for their failure in life to make it big and reach the American dream. They don't realize it is often the few who have made it bug that are impeding their chances by basically paying for policies that benefit themselves.

Even the Constitution itself in it's most conservative view had been described by historians as a government that protects the interests of the rich (founding fathers). Some historians go as far as to argue that the founding fathers had no plans for having social mobility and that the only reason there was a democratic process in the first place was to prevent a tyranny.