Answer:
In response to the Soviet blockade of West Berlin's land routes, the US starts a major airlift of food, water, and medicine to the besieged city's residents. Supplies from American planes kept the over 2 million people in West Berlin alive for nearly a year.
Explanation:
The harnessing of electricity radically transformed American business since this meant that power from electricity could power lightbulbs, which were far more effective than candles and other sources, and that electricity could be used to power machines that increased efficiency.
Four modernizaron is the correct answer
