Because it meant that they wouldn’t have to fight with the south. It was also because slaves picking cotton in the south helped businesses make money in the North
The correct answer to this open question is the following.
Although you did not include the timeline for reference, we can say the following.
Historians and Anthropologists agree that Ancient Indians migrated from Siberia to North America approximately 14,000 years ago. They were hunter-gatherers from the Paleolithic that came from Asia to North America when they crossed the Berin Strait that was frozen due to the extreme cold temperatures of the time. They crossed from modern-day Russian territory to Alaska, and they descended through North America, following herds to hunt them and feed their families until they started to settle in some places.
During the early 1900s, the populations of US cities located on the West Coast were the highest, but by 2000, the populations of cities located in the Midwest became greater than those of the East Coast.
Electricity (the light bulb specifically). Artificial lighting extended the amount of time people spent outside socializing and instigated an expansion in the entertainment industry
Plessy v. Ferguson set forth the doctrine of "separate but equal" which enabled institutionalized segregation as long as things were "equal"
However, the Court did not define what equal really meant.
So, you might see a bathroom for African-Americans that was a hole in the ground while the whites only bathroom was pristine and modern.