I realize that ALL countries have had slavery in their history and racism and prejudice while it DOES exist and will never go away, it is not "systemic" and is not the reason that certain people fail in their lives. It is their parents' decision making and their own decision making abilities that affects their lives and it is up to the individual to fix those issues.
And America is the greatest country in the world, because it enables those though free will, decision making, and hard work to succeed. There isn't a country who means as much to the world, and has done more to advance freedom and liberty, despite the mistakes and flaws it has had. There are many reasons why people from literally every country in the world want to immigrate here.