The main ideals espoused by communists are the abolition of all private property and the rule of the working class.
Answer:
It depends on what you have been taught, but I would personally say negative because of the diseases that destroyed Native Americans and the rise of slavery.
On the flip side, if you're thinking of positive, it did help exchange new ideas and goods (the Columbian Exchange) between the worlds. It also allowed a safe haven for those persecuted (like the Protestants) and allowed countries to dump their inmates onto the new land.
I'm gonna go with A "It caused the decline of cities in the South and West." Hope this helps.
