Question

Which two factors helped the Greek city-states develop strong economies?

trade
the mountainous terrain
colonization
war

Answer 1

war, trade and colonization

Step-by-step explanation:

Answer 2

Momentarily war always gives a kick start to an economy. But not always. The problem the United States is having right now is not winning the war. It is winning the occupation in Iraq and Afghanistan.
A mountainous terrain would be a hindrance to trade.

I would pick trade and colonization. They did do some of that. A third answer is that they developed things to sell.