What Union general came up up with the strategy of the blockade?

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,

Explanation: that is the answer

its main object was the establishment of "settlement houses" in poor urban areas, in which volunteer middle-class "settlement workers" would live, hoping to share knowledge and culture with, and alleviate the poverty of, their low-income neighbors.

a phrase from a poem by ralph waldo emerson about the battle of lexington and concord. emerson's words read, “here once the embattled farmers stood / and fired the shot heard round the world.”