I believe that the answer to the question provided above is because of industrial revolution US shipping industry flourish in the late 1700's
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The United States Indian Industrial School in Carlisle, Pennsylvania, generally known as Carlisle Indian Industrial School, was the flagship Indian boarding school in the United States from 1879 through 1918.
For those in the industrial sector, organized labor unions fought for better wages, reasonable hours and safer working conditions. The labor movement led efforts to stop child labor, give health benefits and provide aid to workers who were injured or retired.
The death toll was substantially higher for both civilians & military forces.
Answer: The colonists had never accepted the constitutionality of the duty on the tea
Explanation: