Vicksburg was essential to controlling the Mississippi River.
Explanation:
The city of Vicksburg in Mississippi was one of the most important locations that would help determine who succeeds in the Civil War. And it was the desire to conquer this city that Lincoln famously declared as "the key".
Vicksburg was along the Mississippi River and also a major stronghold of the Confederate troops. The capture of this city would determine which way the War will sway. Abraham Lincoln considered it important because it was essential to the controlling of the Mississippi River.
He was recalled to active duty as commander of the U.S. army forces in the far east. A series of disasters followed, beginning with the destruction of his air forces on December 8. 1941, and the invasion of the Philippines by the Japanese. His forces had to withdraw from Bataan.
Progressive ideas are used in preparing for the military is because you don't want to get your country bankrupt and you also don't want to throw everything you got right away