With ALL due respect and reverence for your POV, maybe history can offer some perspective regarding the U.S. evolving dynamic of several distinct periods and political motivations.

+ Revolutionary War and War of 1812, one of American "War Hawks" objectives was the conquest of Canada yet later seen as leverage against British influence and support for Native American resistance.
+ Manifest Destiny, applied to westward U.S. expansion across the North American continent…Billy Seward openly expressed beliefs in this inevitable expansion (e.g. Alaska).
+ Mid-to-Late 19th Century, Canadian economic uncertainties led some Canadian merchants to call for annexation. American tariffs pushed twd u.s. hopes that Canada would join the U.S. to avoid 1800’s British Corn Laws.
+ Post Civil War the U.S. occasionally sought but failed to acquire parts of Canada through negotiation or in payment for claims.
+ Fenian Raids while not “official” U.S. government actions, Irish-American groups known as Fenians conducted raids into Canada aiming to pressure Britain by creating instability in British North America.
+ War Plan Red was reportedly a U.S. War Department a hypothetical plan for a conflict with Britain that included invading Canada (e.g. 1920-1940).

IMHO historically speaking, the U.S. has absolutely exhibited expansionist tendencies throughout its history regarding Canada. Strong Canadian Nationalism and resistance over time has led to U.S. recognition of we Canada's sovereignty.
This leads to my firmly held belief that the strong bilateral relationship have led to a reality where the idea of the U.S. taking over Canada is no longer a serious political or military objective…regardless of the today’s political rhetoric.

I respectfully reserve my right to be wrong.

Grateful Always,
PaulnKC