People are very adaptable and will consider all that things new normal. XIX century Americans would consider an income tax in a peacetime grossly inappropriate, creepy and a violation of their dignity after all.
And the more or less permanent state of war we find ourselves in could also be considered a new normal we've adapted to that XIX century Americans would find creepy and grossly inappropriate.
No, the US was at war for essentially the entirety of the 19th century.
Pretty much, the US has always been at war. I mean, they used to have a War Department, which got renamed Defense Department for PR.