As towns are established...along the rivers Savannah and Atlanta, they will make such a barrier as will render the southern frontier of the British Colonies on the Continent of America, safe from Indian and other enemies
- General James Oglethorpe, 1773
Which human geographic factor most likely prompted this observation?
The number of religious sects in the British colonies
The Spanish land daims close to the British colonies
The Caribbean slave trade with British colonies
The number of Quakers living in British colonies