Answer:
expansion:, being larger or more extensive.
economics:." concerned with the production, consumption, and transfer of wealth."
Explanation:
Hundreds of Indian peoples, tribes, languages, and ways of life" would be the best option from the list, since the native population of the United States was incredibly diverse.
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The Government helped to build the Transcontinental Railroad by passing legislation to finance it. The Pacific Railway Act authorized the construction of the railroad across the country.
The government gave land grants to the railroad companies so they could build the tracks and also sell them to finance the construction. Public lands were divided into one-mile-square sections. Between 1850 and 1870 7% of the land in the US was given to 80 railroads companies.
