What is a waterfall between Lakes Erie and Ontario?

Niagara Falls

Explanation:

The Niagara Falls is the waterfall that is between lake Erie and lake Ontario.

a social contract.

"a social contract is an agreement between citizens and their leader where the citizens give up certain freedoms in exchange for protection. the constitution of the united states is an example of a social contract."

the map that was shown mostly had eastern asia highlighted. the answer would mostly likely be "the spread of communism into eastern asia set the stage for the korean war."

hopefully this .