Why was the Louisiana purchase such a great mistake for United States?

Before the civil war, the constitution protected slavery -true -false

Why did some people support supply-side economics and others opposed it? it addressed the supply of goods and ignore demand. it called for large tax cuts for the wealthy. forigen production played a significant role in the plan. the program called for increased government spending.

How did the industrial revolution give an advantage to industrialized european nations over non-industriallized nations?