The ghettos facilitated the eventual extermination because they were hurdled up in one place.
Ghettos were an Eastern phenomenon because of space and money issues which were more common in eastern Europe than in Germany.
Jews maintained hope through praying and through hoping that they would be able to sneak out of the country to somewhere else.
The invasion of the Soviet Union differed because the Soviet Union put up a much harder fight and wasn't overrun as was Poland at the time.
