By 1863, control of most of the mississippi river was in union hands. to gain control of the last major port city serving as an open shipping door to the south, grant weakened the enemy with a military campaign that lasted several months. first he isolated the port city by gaining control of the railroad, and then he began a seven-week artillery siege to force surrender.

what is the port city described above?

Vicksburg

Explanation:

After the victory at Vicksburg, the Mississippi River was at last in Union control. The tactic of cutting supplies was extremely important to the entire Civil War, a strategy that eventually crippled the South.

i would say b. research typically uses a variety of sources

abu bakr, was a senior companion and—through his daughter aisha—a father-in-law of the islamic prophet muhammad. abu bakr became the first openly declared muslim outside muhammad's family. abu bakr served as a trusted advisor to muhammad.