first here's the definition of a Proxy War : A proxy war is an armed conflict between two states which act or on behalf of other parties that are not directly involved in the hostilities. so the US government aided Africa even though they were not directly involved in the war themselves.
If you want to talk about it then it has been complete because the united states has secured land from the eastern side of the united states to the west side of the united states. So the results are the manifest destiny has been completed
