There's one race, the human race.
I'm not convinced ww3 landed in Europe or the US. OK, maybe Golden Gate Bridge, Eiffel Tower and St Paul's cathedral may have been rebuilt, but the London Eye? Or The Shard? Or the exact same street layouts we see today?
How different were Hiroshima, Nagasaki, or Dresden rebuilt after they were bombed? That should give an idea about rebuilding post WW3