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.
The Soviets responded by setting up the German Democratic Republic in East Germany. On May 5, 1955, the American, French, and British forces formally ended their military occupation of West Germany, which became an independent country. Four days later, West Germany was made a member of NATO. For U.S. policymakers, this was an essential step in the defense of Western Europe.