Why is pittsburgh called the "steel city"?

What is the greatest challenge to the palestinian authority government in israel? a) territorial size b) lack of citizen participation c) disputes among parties d)threats from arab forces

How does specialization enable countries to trade with one another? a country can make and sell goods affordably and buy goods that it is inefficient at making. a country can make what it chooses and sell its goods to other countries. a country can decide to buy everything it needs from other countries. a country can efficiently make goods that were once difficult to make.

Whose political philosophy is mostly clearly reflected in the declaration of independence