Why did some people oppose Seward’s proposal to purchase Alaska? All Americans believed that the US was large enough and there was no need for expansion.
Alaska had already been explored and was found to lack resources to support the economy.
The country was already in debt, and Alaska’s climate and terrain were viewed as too cold.
The belief in Manifest Destiny kept many Americans satisfied in their own local area.

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a, c, & d are correct:

they wanted lands to settle the extra population.

they wanted new markets for english goods.

they wanted to avoid civil war.

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.