Better working hours is also a possible answer. The Square Deal was an attempt to settle Poot working conditions between miners and employers. The terms of the deal included shorter working days and safer working conditions
Possibly the last one or the third one.
Answer:
Best Friend of Charleston
Locomotive
Description
The Best Friend of Charleston was a steam-powered railroad locomotive which is widely acclaimed as the first locomotive to be built entirely within the United States for revenue service. It produced the first locomotive boiler explosion in the United States.