Answer:
Cultural Structure.
Explanation:
The Five Civilized Tribes refers to the five Native American nations—the Cherokee, Choctaw, Chickasaw, Creek (Muscogee), and Seminole. These were the first tribes that were considered to be "civilized" by the European settlers. The tribes each adopted Christianity, literacy, intermarriage (with white Americans), centralized governments, plantation slavery practices, etc.
On 10 January 49 BC, leading one legion, the Legio XIII Gemina, General Julius Caesar crossed<span> the </span>Rubicon<span> River, the boundary between the Cisalpine Gaul province to the north and Italy proper to the south, a legally-proscribed action forbidden to any army-leading general.
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March 3rd, 1918 is the date the treaty was signed.
C. It let to the mass migration of the Indian elite.