It's wiki, but:
https://en.wikipedia.org/wiki/Spanish_Florida#Possession_by_Britain
"
The Spanish government assumed that the boundary was the same as in the 1763 agreement by which they had first given their territory in Florida to Britain, claiming that the northern boundary of West Florida was at the 32° 22′ boundary established by Britain in 1764 after the
Seven Years' War. The British line at 32° 22′ was close to Spain's old claim of 32° 30′, which can be justified by referring to the principle of actual possession adopted by Spain and England in the 1670
Treaty of Madrid.
[43] The now independent United States insisted that the boundary was at 31°, as specified in its Treaty of Paris with Britain.
After American independence, Spain claimed far more land than the old British West Florida, including the east side of the Mississippi River north to the Ohio and Tennessee rivers.
[44] This expanded claim was based on Spain's successful military operations against the British in the region during the war. Spain occupied or built several forts north of the old British West Florida border, including
Fort Confederación,
Fort Nogales (at present-day
Vicksburg), and
Fort San Fernando (at present-day
Memphis).
[45][46] "
44: Weber, David J. (1992).
The Spanish frontier in North America. New Haven, Connecticut, USA: Yale University Press. pp. 277–279.
ISBN 978-0-300-05917-5. Retrieved 2011-03-21.
the historic Georgia border dispute should be pretty easy to find.