What obstacles did builders of the two railroads
have to face?

harsh winters with deep snow

supply shortages

conflict with American Indians

scarcity of water

Explanation:

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the next question it asks the answer it "Equipment, rails, food, and even water had to be shipped long distances. "

frederick the great and the war of austrian succession. frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. he also declared himself king of bohemia, and maria theresa sent troops to retake bohemia. in august he led 80,000 of these men across the frontier into bohemia, his

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