Why is the letter that Roosevelt sent referred to as the "Green Light" letter..
Dant

He basically gave a "green light" to baseball in a letter. In what has become known as the “Green Light Letter,” Roosevelt said, “I honestly feel that it would be best for the country to keep baseball going.” Roosevelt stated that baseball could be a source of relaxation for American workers, whose hard work and well-being would be essential to victory.

Explanation:

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first industrial revolution - the first wave of the industrial revolution lasted from the late 1700s to the mid-1800s. it industrialized the manufacture of textiles and began the move of production from homes to factories. steam power and the cotton gin played an important role in this period.