Black Population Quotes
Darwin was then a very young man, who had personal witnessed the slavery in South America and the Caribbean when he was on his famous expedition on HMS Beagle. See {630961} & {630962}. He was so disgusted with slavery that he hoped there would be armed slave revolutions and takeovers as had occurred in Haiti. Many of the English upper classes were radical when it came to slavery.
Preclearance was a requirement that any change in the voting or registration laws, rules or procedures needed to be approved by the Federal Justice Department. He was testifying about why preclearance was important and why it was placed in the Voting Rights Act every time it was reauthorized. See {635271} for what happens without preclearance.