Read the excerpt. Vicksburg is the key! The war can never be brought to a close until that key is in our pocket.

–President Abraham Lincoln

Why did President Lincoln consider Vicksburg important?

Vicksburg was the first capital of the Confederacy.
Vicksburg was the home of an important Union armory.
Vicksburg was essential to controlling the Mississippi River.
Vicksburg was a major supplier of weapons for the Confederate army.

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.

Thus, the correct answer is the third option.

"the attempts of the proletariat to rise above this abasement"

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