Answer:
B. Westward expansion
Explanation:
The transcontinental road in the United States linked the east and the west. In 1949 settlers started to move to the west as a result of the discovery of gold in California, the journey involved was very tiresome and dangerous because people had to travel pass mountains and rivers, but there was another alternative which involves traveling by the sea for about 8 months. This lead to the construction of the international railroad making transportation easier and cheaper
The process of relocating tribes to new areas began with the Indian Removal Act of 1830, during the Andrew Jackson administration. This act required all Native tribes to relocate west of the Mississippi River. These original attempts to deprive indigenous people of their native lands took the form of treaties.
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