1. The trade war with China is back on — not that it was ever really off.

President Trump said he would impose a 10 percent tariff on another $300 billion of Chinese goods on Sept. 1, after a meeting of U.S. and Chinese trade negotiators in Shanghai failed. Above, the Port of Long Beach in Los Angeles.

Mr. Trump said China had failed to follow through with promises to purchase more American agricultural products, and to stop the sale of the powerful opiate fentanyl into the U.S. The escalation of the long-running trade dispute triggered a sharp sell-off in U.S. stocks.