Post-racial United States is a theoretical environment in which the United States is free from racial preference, discrimination, and prejudice.

What does post mean?

post- a prefix, meaning “behind,” “after,” “later,” “subsequent to,” “posterior to,” occurring originally in loanwords from Latin (postscript), but now used freely in the formation of compound words (post-Elizabethan; postfix; postgraduate; postorbital).

What is a race post time?

: the designated starting time of a horse race.