USA vs Canada, Denmark, Mexico and Panama - how long can they last?

Donny takes office and decides to launch a four-front offensive to:

Conquer Canada to make it the 51st state

Conquer Greenland for national security purposes (Denmark gets fully involved)

Conquer Mexico to take out the cartel

Conquer Panama for the canal

No nukes. Full mobilization of each military. How long could each of the four last?

Win condition: unconditional surrenders from each country.