Bloody Kansas and Election of President Lincoln
Explanation:
The South belived that Lincoln was going to free all the slaves until states from the south started to succeeded from the union. Bloody Kansas caused people from the north and south to compete for the right of free or non free slave state.
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The Transcontinental Railroad was completed in 1869.
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Alfred T. Mahan supported the building of a strong navy because they wanted "China to protect shipping lanes."
He was the leader when the United States was an industrial and agricultural success.