Donald Trump’s combative trade policies have tipped the world economy into a downturn clouded in heightened uncertainty, with the US among the hardest hit, the OECD said.

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.

Economic growth will slow this year and next as the trade war hampers development in the United States and around the world, the Organization for Economic Cooperation and Development said.