Why were the Inca considered a highly sophisticated civilization and empire? What was their most valuable achievement or advancement and why?

Which is the main inference that can be drawn from adam smith's book the wealth of nations? a) for an economy to work flawlessly, it shouldn't have to serve and moral goals.b) the government must control a free-market economy, or economic problems will arise.c) a free-market economy works well only without the government's interference. d) free trade will only hurt economies and should be stopped by governments.

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

What were the effects of the great reform act of 1832?