Muhammad ibn Musa al-Khwarizmi
Confederate capital of Richmond is captured. The Rebel capital of Richmond, Virginia, falls to the Union, the most significant sign that the Confederacy is nearing its final days. ... On the evening of April 2, the Confederate government fled the city with the army right behind.
A lot of people lost their lives in the Great War.
Ok i tired my best, but these are river valley civilizations so i hope it helps
Indus Valley
Yellow River
Mesopotamia
Egypt
61 since he was born in 1908 was took office in 1969