Assigned in my Proclamation of the 19th instant, a blockade of the ports of the States of South Carolina, Georgia, Florida, Alabama, Louisiana, Mississippi, and Texas was ordered to be established;

And whereas, since that date, public property of the United States has been seized, the collection of the revenue obstructed, and duly commissioned officers of the United States, while engaged in executing the orders of their superiors, have been arrested and held in custody as prisoners, or have been impeded in the discharge of their official duties without due legal process.

What is the main purpose of the proclamation?

It calls for a Confederate blockade of Northern ports.

It calls for a Union blockade of Southern ports.

It calls for Union troops to invade Southern territory.

It calls for the United States to take all revenue from the war.

The answer is (b) "it calls for a blockade of southern ports.