Carter assured Americans following the treaty’s signing that the US military would never “be directed against the territorial integrity or the political independence of Panama.” But in a series of holiday season social media posts and remarks, Trump claimed that US merchant ships were being charged exorbitant rates for using the waterway. He claimed the canal was being controlled by China and threatened to demand its return to US control. There is no evidence that American vessels are facing price discrimination, and, while Chinese firms do have interests in Panamanian ports, Beijing does not control passage through the canal.

Trump’s warnings are widely being seen in the context of his broader strategy of using threats to build leverage in diplomatic and trade talks – an approach that would likely horrify Carter. Still, if the president-elect decides to tear up the Panama Canal treaties, he could end up facing many of the same geopolitical complications that Carter tried to avoid.

Both Carter and Trump have wrestled Iran

For years after Carter left office, Democrats were stigmatized by Republicans as weak on national security because of the the hostage crisis at the US embassy in Tehran that did more than anything to rupture Carter’s reelection bid.

A botched attempt to rescue the hostages with a daring special forces mission ended in disaster when a US helicopter crashed in the desert killing eight US servicemen. The calamitous political blowback from the raid was in the minds of many Obama administration officials during the high-stakes, and ultimately successful, mission to kill Osama bin Laden deep inside Pakistan in 2011.

The Iran hostage crisis allowed Reagan to lambast Carter as an ineffectual leader who weakened US respect abroad – much as Trump did to Biden and Harris in the 2024 race. Similarities with the 1980 campaign also reverberated through this year’s election when Trump likened the inflation crisis and high prices of Biden’s term to the economic blight that settled on the United States in the late 1970s.

In the final humiliation for Carter, the last hostages were released by Tehran on January 20, 1981 – 20 minutes after Reagan was sworn in.

Trump will face his own risky choices on Iran. The Islamic Republic is weaker than it has been for years, after its proxies Hezbollah and Hamas were devastated by Israel following the October 7, 2023, attacks and after the fall of the allied Syrian regime of President Bashar al-Assad.

But that weakened position could make Iran rush for a nuclear weapon in a bid to secure its clerical regime – a move that would present Trump with a decision on whether to take military action.

The standoff is a reminder that while the Carter presidency now seems like ancient history, the geopolitical tangles that consumed his administration – involving Iran, the Kremlin, the Western Hemisphere and North Korea – continue to confront presidents across the decades.