Which additional territories could the US have acquired throughout its history?
Note: these American territorial acquisitions have to be extremely realistic and extremely plausible.
Also, you can't sacrifice any of the US's our TL territorial acquisitions in order to acquire additional territory in this TL. For instance, if the US acquires southern Ontario in 1783 but this ends up causing the US not to acquire Louisiana Territory later on (even if it's the result of the butterfly effect), then it can't work for my scenario here.