Because it had a reputation as the most segregated city in the South
The best option from the list would be that "<span>He completely changed his views on Reconstruction," since before taking office he had used very radical rhetoric. </span>
The answer is siege.
Siege, also known as blockade or encirclement, is an attack where a military force surround a city or fort in order to make them surrender. This would trap the enemies with the force encircling them. The force basically encircles them then cuts off their resources and supplies and compels or persuade them to surrender.
The presidents power to convene congress is a check he or she must inform congress of the State of the Union, can convene one or both houses of congress under "extraordinary occasions."
