The only ground meat pie with a pastry crust that I'm aware of is tortiere... No pastry in Canada either, nor does that appeal. The only ground meat pie with a pastry crust that I'm aware of is tortiere, also delicious. Pot pies generally have something chunky and stewish inside (beef or chicken).
Germany never did. East Germany became communist in 1945 when the USSR ocupied it after WW II.
No. Adolf Hitler took over the country and the people. The Soviet Union (CCCP) controlled East Germany until November 3, 1990.   After World War 2 Germany was at first run by the Allies, who divided the country into four zones of occupation: British, American, French and Soviet.