Describe two example of how the u. s. turned its back on isolationism, getting involved to stop the spread of communism.

in places where communism threatened to expand, American aid might prevent a takeover. ... To avoid antagonizing the Soviet Union, Marshall announced that the purpose of sending aid to Western Europe was completely humanitarian, and even offered aid to the communist states in the east.

the answer is migration

the crusades are one of the most significant events in the history of europe and the middle east.   they were a series of religious wars carried out by christian crusaders from europe during the timeframe of the middle ages.   beginning in 1095 ce, the crusades saw european knights and noblemen travel to the middle east in an attempt to capture the holy land away from muslim people that had controlled the region for the previous centuries.   the term crusade means ‘cross’.   therefore, the europeans that became crusaders viewed themselves as ‘taking up the cross’.   in fact, many of the crusaders wore crosses on their clothing and armor as they made their pilgrimage to the holy land.

explanation: