One reason the decision in Dred Scott v. Sanford (1857) was so controversial is that it

A. strengthened the idea of popular sovereignty

B. gave enslaved persons full citizenship

C. ruled that Congress had no power to limit slavery in the territories

D. supported Harriet Beecher Stowe's point of view in Uncle Tom's Cabin

C. ruled that Congress had no power to limit slavery in the territories

Explanation:

In Dred Scott v. Sandford (argued 1856 -- decided 1857), the Supreme Court ruled that Americans of African descent, whether free or slave, were not American citizens and could not sue in federal court. The Court also ruled that Congress lacked power to ban slavery in the U.S. territories.

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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