What was the Treaty of Greenville?

Explanation:

The Treaty of Greenville, formally titled Treaty with the Wyandots, etc., was a 1795 treaty between the United States and Indians of the Northwest Territory including the Wyandot and Delaware, which redefined the boundary between Indian lands and Whiteman's lands in the Northwest Territory.

the difference is that white collar worker performs skills like worker as a scientist or well blue collars do physical work and they do services like being a cook.