Answer:
The Columbian Exchange caused population growth in Europe by bringing new crops from the Americas and started Europe's economic shift towards capitalism
The nations of Germany and the United States
The Marshall plan helped in stopping the communist aggression and expansion in Europe during the Cold War by establishing a global trade wherein it emphasizes "free market" and "encourage European peace." The plan helped to economically sustain and stabilized the war-torn countries in Europe.
They located in an area that traders could reach in a single season.