Answer:Transatlantic slave trade, segment of the global slave trade that transported between 10 million and 12 million enslaved Africans across the Atlantic Ocean to the Americas from the 16th to the 19th century. It was the second of three stages of the so-called triangular trade, in which arms, textiles, and wine were shipped from Europe to Africa, slaves from Africa to the Americas, and sugar and coffee from the Americas to Europe.
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The building of the Transcontinental Railroad had a huge impact on American life and economy. It greatly sped up travel time. Before the railroad, you needed around six months to travel from the coast of California to New York and after it started with the operation you needed only around one week. This meant more expansion of the industry, trade, businesses, and expansion of populated areas. Unfortunately many Native American tribes were displaced and the US military was called in to fight the tribes.
They are appointed by the President and approved by the Senate
I think that it would be D
