The approximate distance from the northernmost point of the original 13 states to the southernmost point is 980 Miles.
Explanation:
Maine and Florida were not components of the Thirteen colonies. Thus the new Hampshire in the northmost point of the U.S and Georgia is the southmost point of the U.S.
Reach from Georgia to New Hampshire is 1,577 kilometers. The air trip (bird fly) smallest length connecting Georgia and New Hampshire is 1,577 kilometers, which is equal to 980 miles.
If you fly with an aircraft (which has a normal velocity of 560 miles) from Georgia to New Hampshire, It needs nearly two hours to arrive.