The Tulsa race riot of 1921. It happened between may 31 and june 1.
According to political scientist Brian R. Dirck, the most famous executive order was by President Abraham Lincoln, when he issued the Emancipation Proclamation on January 1, 1863: The Emancipation Proclamation was an executive order, itself a rather unusual thing in those days.
Answer:
(B) Underground Irrigation Canals
Explanation:
The study of human society