Answer:
Artificial intelligence such as Robots
Explanation:
In 18th century, slavery was at peak value since there was high need of labour.
In 20th century, scientists have created robots which has replaced slaves hence slavery decayed.
Answer:
After this vote, the antebellum political landscape was forever changed. The failure of the Wilmot Proviso only put off the issue of slavery for so long.
Explanation:
The Mexican-American war (1846-1848) changed the slavery debate. It almost doubled the size of the United States and began a debate, between Northerners and Southerners, over what to do with the newly acquired land.
The answer is 1501 AD - 1600 AD