Answer:
wala po ibang tanong ung madali lang po
The Union blockade of the Southern ports was part of General Scott's Anaconda Plan.
The Anaconda plan involved choking off the Southern supply of goods via a port blockage in tandem with the Union Army coming up, around, and down the Mississippi River and working through the south systemically.
I would assume the assume is TRUE considering Pearl Harbor was undefended and unable to retaliate.
Hope this is the answer you were looking for and that it helps!! :)