The funny thing is, suddenly i have that problem at the year 1950 too..... but now the USA map looks normal only the Europe map is filled with black spots.
I tried everything but so far no luck......
This helped me: as User Catan22 said: Steam \ userdata \ username \ 446800 \ locale then delete the ''texture_cache'' folder and start a new game. Problem went away and no crashes.
Thank you Catan22 and everybody else.