Right after WWII, the US rehabilitated its “enemies,” Germany, Italy, and Japan, while starting the Cold War with its “ally,” the USSR. Rehabilitating Germany & Japan was important for the US’ containment strategy against the USSR.

If we see that Germany is winning the war, we ought to help Russia; and if that Russia is winning, we ought to help Germany, and in that way let them kill as many as possible […]. — Senator and future president Harry S. Truman, 1941