From April 12, 1861 - May 13, 1865
Answer:
I would say Dust Bowl most likely
Explanation:
B because After a string of Union defeats, this tactical victory provided Abraham Lincoln the political cover he needed to issue his Emancipation Proclamation.
The integrated circuit was essential to the world of computation because it "<span>allowed computers to attain more computing power", both in the sense of speed and affability.</span>
