How were black people prevented from voting despite the Fifteenth Amendment?

Apurging of emotions, specially pity and fear

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.

Two types of resources are natural and human. true or false