This is kind of true but you also have to remember how fucking huge the US is not only in land but people. According to a 2017 study there were 2.1 million Africans living in the US. The top three states with the most were
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Texas's total population: 29,000,000
California total population : 39,510,000
New York: 19,450,000
So Texas is 1.5% African born in population
California is 0.8% African born in population
New York is 1.3% African born in population
Now factor in they are almost exclusively in major urban centers you would never want to be in the first place.