The number of comflict that will be opened in any semi formal or formal way is fading.
I understand what you mean, but 3000 miles of oceans no longer protect us, and a pre emptivie srtike, by the US, under the circumstances, becomes more and more likely.
3 out of the last wars in which we have be involved have been started by, so -called, "suprise attacks".
In the Phillipine instrustion, the was was only stoped by the taking of Ameliano Aguinaldo at a parley.
Others: Port Arthur, Pearl Harbor, the Spanish American war (was though to be an attack on the
Maine later proven false, an internal explosion.
The "notion" of Chilvary is kinda on the wane.
"All Enlightenment Gratefully Accepted"