President Trump’s order doubling tariffs on steel and aluminum imports from 25% to 50% took effect Wednesday. In response, Mexican President Claudia Sheinbaum accused Trump of violating the United States-Mexico-Canada Agreement and said Mexico would soon announce countermeasures.

President Trump doubled almost all aluminum and steel import tariffs, seeking to curb China’s growing dominance in global trade. These six charts show the tariffs’ potential economic effects.

The United States doubled tariffs on steel and aluminium imports on Wednesday, activating a hike in the duties on the imported metals to 50% from the 25% rate introduced in March. The day also marks the Trump administration’s deadline for trading partners to submit their “best offers” to avoid further steep import duties set to take effect in early July.