Was the overall impact of the mongol conquest more positive or negative

Negative.

Explanation:

I am biasing of the impact from the point of view of people who were not Mongols. One of the main reasons its negative was the destruction and pillaging they caused, Mongols killed, looted, and other heinous actions to people who didn't want to be under Mongolian Rule. Places like Baghdad, which a Golden Age of Islam was happening, was destroyed and became a barren land because the Mongols sieged it and destroyed its irrigation system, The Mongols also burned crops, diverted rivers and catapulted diseased corpses into cities in order to starve or infect people with deadly diseases. Some historians believe that the use of dead bodies by the Mongols is what brought the Black Death to Europe.

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.