The answer is 'Railroads'
The Industrial Revolution in England lead to the development of trains and fast travel.
The United States quickly adopted the technology and brought in English businessmen and engineers to develop railroads in it's sprawling western states.
Railroads were integral in the early years in to cement newly acquired states under the control of the Federal government.
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Answer:
The Dare Stones are a series of stones inscribed with messages, supposedly written by members of the lost Roanoke colony. The colonists were last seen on Roanoke Island (off the coast of what is now North Carolina) in August 1587, and the mystery of their disappearance has since become a part of American folklore.
Explanation:
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It was considered a turning point, because at the time the U.S. was in the American-Spanish war. It took place from April to August in 1898. the war ended in victory for the United States and the end of the Spanish Empire in the Pacific and <span>Caribbean</span>. Only ~113 days after the outbreak of war, the Treaty of Paris, which ended the conflict, gave the United States control over the former Spanish colonies of Puerto Rico, the Philippines and Guam, and control over the process of independence of Cuba, which was completed in 1902.