The Church of God was founded in which region that includes parts of Tennessee?

The Church of God was founded in the region known as the Southern Appalachians, which encompasses parts of Tennessee. This area is significant to the Church of God's origins, as it reflects the cultural and historical context in which the church was established. The Southern Appalachians are characterized by their mountainous terrain and a rich tapestry of cultural influences, making it a pivotal location for the formation of a movement focused on holiness and revivalism during the late 19th century.

In contrast, the other regions listed do not align with the historical founding of the church. The Midwestern United States is often associated with different religious movements and denominations that arose later. The Northwestern Territories, primarily concerning regions like areas of Washington and Oregon, are not relevant to the Church of God's beginnings. The Northeast Corridor, home to a variety of religious practices, also does not pertain to the Church of God's inception. Thus, the Southern Appalachians is the precise region where the Church of God was established, making it the correct answer.