11.3.1 End of Occupation - pg 781

Belligerent occupation ends when the Occupying Power no longer has effectively placed the occupied territory under its control. For example, an uprising by the local population may prevent the Occupying Power from actually enforcing its authority over occupied territory. Similarly, the Occupying Power’s expulsion or complete withdrawal from the territory would also suffice because the former Occupying Power generally would not be able to control sufficiently the occupied territory.

I consider the American people voting out the occupying force as an uprising by the local population.

What conditions are you thinking about?