There were no Situation Room meetings and no quiet calls to de-escalate a dispute with an ally. Just threats, counterthreats, surrender and an indication of the president’s approach to Greenland and Panama.

He is tapping into a vision of a United States that is forever growing, forever moving outward.

President-elect Donald J. Trump’s threat to take back the Panama Canal may be posturing, but it could dampen the Panamanian government’s wish to broaden relations with the United States, analysts say.

The prime minister said that while Greenlanders do not want to become Americans, “the reality is we are going to work with the U.S. — yesterday, today and tomorrow.”

Treaties ratified by the Senate in 1978 established permanent neutrality, but some Republicans regret that decision.

President-elect Donald J. Trump’s news conference at Mar-a-Lago was a reminder of what the next four years may have in store.

Few took the president-elect’s combative comments at face value, but they still sent a shudder through a country that the United States has invaded before.

A distant era of global politics, when nations scrambled to grab territory, suddenly seems less distant.

In an hourlong news conference at his Florida club, Mar-a-Lago, the president-elect delivered a hodgepodge of grievances, complaints and false claims.

A multibillion-dollar expansion helped the canal accommodate king-size cargo ships. It might also be fueling ecological upheaval.

Global warming is making both places more important to global shipping and trade.

To return the canal to Panama, President Jimmy Carter worked to change minds and build a bipartisan coalition that put aside short-term political considerations.

The president-elect inaccurately said that Chinese soldiers operate the Panama Canal. But China’s strategic positions in shipping worry Washington officials.

Treaties ratified by the Senate in 1978 established permanent neutrality, but some Republicans regret that decision.

The selection of Mr. Cabrera, a Miami-Dade County commissioner, comes a few days after Mr. Trump called for the United States to regain control of the Panama Canal.