The black hills expedition which led to the increasing need of settling into the country of America and Indian lands was the founding of gold.
Option A is the correct answer.
What was the black hill expedition?
The black hill expedition began by Colonel George Armstrong in the northern and southern parts of Dakota.
In the year 1874, gold was found in the black hills that inducing the white people of the US country to get settled there. This led to an ultimate conflict between the Native Americans and the White People which was known to be as Great Sioux War in the year 1876.
Therefore, the finding of gold in the black hills led to a rise in the settlement of people in America and India.
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