President Trump moved quickly to remake American foreign policy in his first 100 days in office, weaponizing his “America First” agenda with the slashing of foreign aid, expansionist threats toward friendly countries, and massively disruptive tariff regime, which has already roiled global markets and relationships.

While Trump has frequently touted his dealmaking skills amid the turmoil of his first few months back in office, uncertainty and confusion have reigned among allies and adversaries alike.

Americans have taken an increasingly dim view of Trump’s major moves on the world stage. While Republicans are more favorable to the president, an NPR/PBS News/Marist poll found a majority disapprove of how Trump is handling foreign policy.

This includes Trump’s threats to assert control over Canada, Greenland and the Panama Canal, the U.S. withdrawal from its leadership role in global health policy, and drastic downsizing of America’s humanitarian aid budget.

And Trump’s strategies for making peace have so far fallen flat – from the Gaza Strip to Russia’s war in Ukraine.

Here are four main things to know about Trump’s foreign policy 100 days into his administration.

Tariffs raise global anxiety

Trump’s tariffs have been the most consequential move of his first 100 days, with an enormous impact on America’s global standing, introducing conflict with allies and heightening tensions with competitors, particularly China.

“I think Trump does think it’s the U.S. versus everybody else,” said Matthew Kroenig, vice president and senior director of the Atlantic Council’s Scowcroft Center for Strategy and Security.

Kroenig said the other two major beliefs in Trump’s orbit are that the world is........

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