Which civilization was established first? Roman Empire
Roman Republic
Greece
Alexandria

Correct answer is Greece.

Explanation:

This is correct as Greece as civilization emerged in the 2nd Millennium BC, after the migration of different tribes that inhabited this region.

Roman Empire is not correct as this Empire was established in 1st Century BC, during the reign of Octavian August.

Roman Republic was established in 509 BC after the last king of Rome was overthrown.

Alexandria as a city was established in 4th Century BC by Alexander The Great.

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.

i believe it was spain