What is the domino theory?
a. a political theory that was developed during the cold war that stated if one nation fell to communism surrounding nations would likely fall to communism as well
b. a military theory that was developed during world war ii that stated if you eliminate one nation in an alliance that others will quickly fall
c. an economic theory that was developed by john maynard keynes during the great depression that stated if government did not engage in massive spending

union blockade

explanation:

the union blockade in the american civil war was a naval strategy by the united states to prevent the confederacy from trading.

the blockade was proclaimed by president abraham lincoln in april 1861, and required the monitoring of 3,500 miles (5,600 km) of atlantic and gulf coastline, including 12 major ports, notably new orleans and mobile. those blockade runners fast enough to evade the union navy could only carry a small fraction of the supplies needed. they were operated largely by british citizens, making use of neutral ports such as havana, nassau and bermuda. the union commissioned around 500 ships, which destroyed or captured about 1,500 blockade runners over the course of the war.

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