Zebulon Pike.
Zebulon Pike.
The Mississippi River helped form the boundary between British and Spanish territory in 1763.
The Appalachian Mountains.A wall of Mountains The 1,500-mile- long Appalachian Mountain range formed a natural barrier to westward expansion.
Between 1521 and 1821, when it became an overseas territory of the Spanish Empire. At the time, several Spanish conquistadors explored the northern territories, founding several cities along the way such as Santa Fe (NM), San Antonio (TX) or Los Angeles (CA).
The Ohio river
The Louisiana Purchase.
Mississippi River and Rocky Mountains.
A territory of the western United States extending from the Mississippi River to the Rocky Mountains between the Gulf of Mexico and the Canadian border. It was purchased from France on April 30, 1803, for $15 million and officially explored by the Lewis and Clark expedition
The sea.
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The Red River
Comancheros ranged east to the Wichita Mountains of Oklahoma, southeast as far as the Davis Mountains in Texas, and north to the Dakotas. The distinctive form of trade associated with them began with a treaty of 1786 between the Spanish governor of New Mexico, Juan Baptista de Anza, and the Comanche Indians of the plains, allowing trade between New Mexico and the Indians in return for Indian protection of Texas against intruders on Spanish territory.