A growing number of countries, including American allies, are striking trade deals as the Trump administration erects a higher fence around its global commerce.

President Trump’s tariffs hurt China, but his other actions have alienated U.S. allies, giving Beijing an opening to strengthen its global standing.

Amid warnings of price increases, Canada moved quickly to retaliate, China said it had planned countermeasures and Mexico said it would soon unveil its response.

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To wean itself off Russian natural gas, Europe has found new sources of energy, including imports from the United States. But high costs are straining the economy.

The invoking of national security to unravel trade agreements could scramble the international trading system in China’s favor.

There are many reasons to regret Trump’s latest experiment with tariffs, but let’s take prices and migration.

President Trump has insisted that his new tariffs on America’s largest trading partners will not increase prices for Americans. But a review of how they work suggests that is not the case.

General Motors and a few other companies make as much as 40 percent of their North American cars and trucks in Canada and Mexico, leaving them vulnerable to tariffs.

China chose swift retaliation for trade measures in the first Trump administration, but that led to an upward spiral of trade measures and much broader tariffs.

Manufacturers from Asia, Europe and elsewhere have poured billions into North American supply chains that could be hit by new taxes on Mexico, Canada and China.

Ties between the United States and Mexico have deepened over 30 years of free trade, creating both benefits and irritants.

Some oil refineries will probably struggle to replace imported crude oil if President Trump imposes 25 percent tariffs on products from Canada and Mexico.

Michael Grimes, a top banker at Morgan Stanley, would become the latest leading tech figure to join the Trump administration, as a senior official at the Commerce Department.

Gross domestic product grew by 2.3 percent in the fourth quarter, capping a more robust year than expected. Policy uncertainty clouds the outlook.

By declaring he’d put tariffs on goods from the South American country, the president imperiled a growing influx of foreign investment there.

Oil and gas executives welcomed President Trump’s early moves on energy policy, but many said they did not plan to increase production unless prices rose significantly.

The country’s leader, Gustavo Petro, backed down after a clash with President Trump, which started when Mr. Petro turned back U.S. military planes carrying deportees.

The second Trump White House is starting out with a remarkable degree of conflict among different individuals, constituencies and worldviews.