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.
C. residency at camp David.
The election for President is really 51 individual elections, one for each state plus DC. The USA is a republic, not a democracy. Each state gets a specific number of electoral votes total to the number of Reps and Senators that state has. All but 2 states have a winner-take-all system.