The interest of a region of the country should never take priority over the interest of the nation as a whole
Push factors include war, famine, descrimination ect. in the native country of the migrant eg Irish people were pushed to emigrate to america and england during the Great Hunger (1845-1849)
pull factors include the promise of good job opportunities in america, hot climate, ect
I would guess the Mediterranean Sea.
So, the Soviet Union controlled the east half of Germany and had it under Communist rule. West Germany was divided among the Allies and had sectors controlled by the United States, England, and France.
