So Canada turned to courting every other level of government, forming something like a doughnut around a White House-shaped hole.

Canadian officials have fanned out across the United States, meeting with mayors, governors, members of Congress and business leaders on matters from trade to the environment.

Ministers’ schedules resemble those of rock bands on summer tours. They travel armed with data on the precise dollar amount and number of jobs supported by Canadian firms and trade in that area.

“They’re going to great lengths, going into parts of America that few cabinet ministers from Canada have gone to,” Mr. Burney said.