If she is just figuring out that there are caste systems in every culture, she is incredibly ignorant.
Of course in the US it is possible for people to move “up” if that is what you want. Not so much in African culture.
Try going to Sudan and “work your way out” of the lower castes.
No doubt she will vote for Kamala, a high-caste Tamil who could become President within months of Jan. 20, 2021, if the Democrats win. Reporters should be inquiring of Kamala if she intends to impose caste rules in the US by executive order. Or if she will ban the consumption of beef.
Nigerians are the most successful group in the U.S. They are Africans.