The Odum of Ala Igbo
Hail Biafra!
They've been throwing around the 40 million black people number since the 60s.
So I believe under counting is going on.
Even in place like LA, I "felt" like there were more black people than the percentages would like you to believe.
They have not been throwing around the 40 million number since the 1960s

I have read government documents (like the Moynihan Report), news media published by African American media outlets like Jet and Ebony. The 40 million number only began to be discussed in the late 2000s/2010s.