Answer:
The class studied poems by these poets; Dickinson, Longfellow, Stevenson, and Poe.
Explanation:
He have four effects of the introduction of steam-powered machinery, and they were all things that did happen. So the answer will be looking for a non-economic effect rather than for something that was not an effect.
Such non-economic effect is the increase in pollution. It is an environmental effect that might have some very mild economic effects (it might for example decrease tourism), but it's not generally an economic effect.
What is 'uw'? Please elaborate
