During the Nullification Crisis . (Choose all that apply) 1.) Jackson allowed South Carolina to ignore federal laws about tariffs

2.) Jackson threatened to send troops to ensure that South Carolina followed the federal laws

3.) Vice President Calhoun resigned his office because he did not agree with Jackson

4.) The crisis was started with the passage of the Tariff of 1832

chlorofluorocarbons are released via: aerosol sprays and refrigerants.

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.