The U.S. and China have had a complicated trade relationship for the last half century. WSJ’s William Mauldin looks at the key moments that landed the two countries on the doorstep of a possible trade deal. Photo Illustration: Heather Seidel President Trump said he plans to meet with Chinese President Xi Jinping next month when he travels to Japan for a summit, in comments hours after Beijing increased tariffs on $60 billion of U.S. goods in the latest escalation of the trade fight. The retaliation from China came in response to the U.S.’s move Friday to raise tariffs on $200 billion of Chinese products. Mr. Trump, who last week threatened to slap tariffs on more than $300 billion of other Chinese products, said on Monday that he hasn’t made a decision about whether…