Crucially important.
It prevented them from Importing and Exporting - in other words, exchanging their plentiful cotton for all the war supplies they couldn't manufacture for themselves, because they were agrarian not industrial.
To starve them of the imported goods they needed, having no manufacturing industry, only agriculture.
skyrocketing food prices in the south
To prevent the Confederacy from exporting its plentiful cotton in exchange for war supplies.
It never did. The Union referred to the South as 'the rebel states'. However, by announcing a blockade of the Southern ports, the Union appeared to be giving the Confederacy the status of a separate nation.
Defeating the Confederacy, and restoring the integrity of the United States.
They are called Blockade Runners
To starve them of the imported goods they needed, having no manufacturing industry, only agriculture.
So that the Confederacy could not export its plentiful cotton in exchange for much-needed war-supplies.
skyrocketing food prices in the south
The blockade was crucial to Northern strategy. Without it, the South could have exchanged its cotton for war supplies, and the result of the war could have been very different. It is hard to see how the war could have been won without it, although the Emancipation Proclamation did keep Britain and France from aiding the Confederates. Just reflect that it took four years to win, even with the blockade in place.
The Confederacy needed British official recognition as a nation to help break the Union blockade.
Union blockade on all ports.
To prevent the Confederacy from exporting its plentiful cotton in exchange for war supplies.
Rapidly rising food prices across the South.
It captured transport vessels, creating acute supply shortages.
Rapidly rising food prices across the South.
Because the Union hoped that by creating a blockade on the ports, the South would be unable to trade, and their economy would be ruined.