How did railroad expansion make natural resources more available in the United States? by increasing the amount of natural resource deposits by making it possible for natural resources to be transported to different cities and towns by using natural resources to build tracks and train equipment by transporting people to cities and towns where they could purchase natural resources

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explanation:

- "the most famous structure by far at saqqara is djoser's step pyramid. dating from the 3rd dynasty (2667—2448 bc), it was the first all-stone complex ever built on earth."

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(202 bc - 220 ad) dynasty started by lui bang; a great and long-lasting rule, it discarded the harsh policies of the qin dynasty and adopted confucian principles; han rulers chose officials who passed the civil service exams rather than birth; it was a time of prosperity