I’m not sure I understand your leaps here.
So a majority of New Mexican citizens petition the Federal Government for statehood, which is granted, which causes the federal income tax?? And somehow, Wilson entering WWI with a ligitimate congressional Declaration of War isn’t covered in the “governing documents of this nation.”
You make no sense to me.
If you mean the Mexican War (1846 not “post 1900”) was an imperial war, that is a fair statement open to debate. However, we have examples from earlier in US history of “imperial” wars - Monroe’s annexation of Florida (~1819) or attempted invasions of Canada during the War of 1812. Note that President Monroe was a bona fide Founding Father, so for anyone to state that the founders never intended the US to conduct “imperial” wars is flat-out wrong.
I do encourage you to learn more about my home state of New Mexico, however. It’s a VERY special part of the United States.
For better or worse, the earlier "imperial" wars you describe were for the purpose of expanding the United States as a nation. It's been decades since we've done that. Now, we grow through colonization even as we allow millions of foreign invaders to pour over our own borders.