Answer:coz people have no other work .....
Explanation:
Thomas Gage, also known as General Gage was responsible for sending those troops for ammunition.
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In November, 1832, South Carolina took "the Ordinance of Nullification", declaring the tariffs null, void, and nonbinding in the state. U.S. Pres.
Because of that Andrew Jackson issued a proclamation that asserted the supremacy of the federal government.
The correct answer is option D. "Companies replaced hand-operated brakes with air brakes on trains". The development of air brakes on trains was a significant improvement of railroad safety. Air brakes function much more faster than hand-operated brakes, because hand-operated brakes required that the brakemen turned the brakes in one car and jump to the next to set the brakes on, and so on.