forcibly brought to the U.S. a

My ancestors were kicked out of Canada and sent to America. It was not a "choice" for them. A lot of the original colonists were kicked out of Europe and sent here by force. Not everyone "chose" to come here.

Nigerians who immigrate to the U.S. by choice are also super successful

Because Nigerian parents value education. They do not belong to a culture that idolizes crime and being uneducated.

comparing two completely different phenomenons.

Racism does exist. But black people are not the only "non-white" people in America. We have plenty of Hispanics and Asians. They don't seem to have the same problems as black people. I think it is time for black people to look at themselves. Stop blaming other people and shit that happened 400 years ago for your life NOW.