What increased the number of deaths during the triangle shirtwaist fire

The owners had locked doors to control workers' breaks

Locked doors is the correct answer.

Explanation:

The triangle shirtwaist company factory fire in  New York city killed more than 140 workers. It was one of the most infamous incidents because  the death of workers could have been prevented. Neglected safety features and locked doors in the building were two causes of deaths. This incident shed light on the working conditions in factories and led to the development of many laws for the safety of workers.

the completion of the erie canal spurred the first great westward movement of american settlers, gave access to the rich land and resources west of the appalachians and made new york the preeminent commercial city in the united states.

because its important to learn about other countries and how high tech they are compared to us. also its good to learn about other cultures and how ours differs and in common also we need to learn about companies that we still buy since they ship it here.