The North Africa Campaign and the Invasion of Italy and The Invasion of France were not separate isolated wars in the 1940s. Some argument could be made that the conflict with Japan was separate from the conflict in Europe but even that is not sustainable. It was One War from the first shot in the invasion of Poland until the surrender of Hirohito.
Just so, we are inolved now in One War, the war with Islam. If China takes the occasion of the distraction of America in the ME to attack Taiwan and America gets involved in East Asia it is still the same worldwide War. When the invasion from Mexico becomes or is finally perceived to be critical and is finally opposed, that too, is part of the same War.
The Afghanistan campaign is part and parcel with this Islamic War. America is NOT capriciously going about the world engaging in separate little wars. Islam resurgent has launched a war of conquest against the Western World. There will be several campaigns in the war and many battles. The many fronts in this war will exhaust and finally defeat and destroy America if the Americans do not fight it as what it is- one war that requires a major extremely rapid and destructive defeat of the primary enemy force and political structure. That would be the destruction of Iran, regardless of the likelihood that the Iranian people are mostly nice guys who only want to live their lives in peace.
Michael Chertoff says : stock up on what you might need, if : _________. He's read the Book of Revelation, have you?
Thanks for your erudite comments.