Canadian or Provincial annexation is a terrible deal for 2 main reasons.

US debt, and power projection, is on a near term collapse trajectory. Insane healthcare, military spending levels for no social services is higher effective tax/oppression rate on people/small business. Changes in provincial (and/or federal) government structure would be extremely disruptive.

Territorial possession of the US is far more likely than statehood. Far less generous autonomy (Quebec especially) granted by Federal government, and autonomy eroded continuously like native treaties have been. Increased north/south trade seems nice, but "real states" will get federal manufacturing incentives, and possessions will be hollowed out to 3rd world level. Jones act regulations on sea shipping means high cost of living.

While tariffs decrease unity as they should, the whole "protect steel and auto workers for outrageously expensive cars in states that don't have those industries" is reason for highest GDP states to secede from genuinely corrupt political process, that propagandizes swing states on national socialist domination of uneconomic operations delivering no results for them, and shit product for the oppressed states.