C. They both practiced slash-and-burn agriculture.
If you're asking in general then, the area has to have people who share common customs, belief and language.However, this might not entirely be true as there are some countries which have vast diversity and still portray nationalism.
Hope this helps!!
George Washington: 6 Important Events in First President's Political Career. Washington decided against becoming "king" of the United States. After risking his life and the lives of his troops to lead the fight for independence, Washington returned the power to the people and the representatives they elected.
The First Continental Congress helped unite the separate colonies
