Which event is an example of citizens making a successful effort to change
public policy?
O
A. Congress passed the Fifteenth Amendment, guaranteeing former
slaves the right to vote.
B. Slavery was abolished in the United States in part due to public
pressure.
C. The Supreme Court decision in Roe v. Wade guaranteed the right
to an abortion.
D. The United States entered World War II in support of its European
allies.

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.

explanation:

the addition to geographic boundaries that might have  kept the people of the huang river civilization from traveling to far distance region is that they had learned about the other river valley civilizations but feared contact would bring invasion.

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b. the passage of the equal rights amendment  

explanation:

this mean that anything that someone else could do they could do

a. always outside of government control.