Poor people are less likely to have photo IDs--and black people are disproportionately poor. As for birth certificates many older blacks do not have the original that some states require.
Why is this important?
African Americans must have a photo ID to vote.
When I was living in Florida in 2000 and 2004 African Americans were told their poling place was closed, and they were turned away. So much for photo ID!
iD