Which phrase describes what the "push and pull" theory was about?

Which of the following factors would be a likely reason for low population density

The revolutions in latin america in the 19th century resulted in political independence from europe the end of slavery in each country the establishment of stable democracies social and economic equality for all

Which statement best describes the response by the united states and its allies to the berlin blockade? planes dropped tons of supplies around the city each day. trucks smuggled tons of supplies into berlin about once a week. tons of supplies were delivered to west berlin by boats. tons of supplies were purchased from east berlin each day.