Answer:
They made operations more technical because users had to program their own computers.
Islam spread into Europe in 1543
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A.The empire was regularly attacked by Arab Muslims.
The Byzantine Empire was a prized region to obtain for the Arab Muslims.
The Arab Muslim Empire regularly attacked the Byzantine Empire. The goal was to gain access to the Anatolia peninsula which was home to Constantinople. Constantinople was the trading center to Europe and and to Asia. Many emperors made the Byzantine Empire a goal and it fell in 1453 under the leadership of Mehmed II.
The most accomplished Confederate General (South) was General Robert E. Lee, commander of the Army of Northern Virginia.
General Ulysses S. Grant led the Union Army during the later years of the war and later ran for office, becoming the President of The United States.