China is doubling down on efforts to keep unprofitable factories afloat despite for years pledging to curb excess capacity, adding to a glut of basic materials flooding the global economy. According to a Wall Street Journal analysis of Chinese public companies, Chinese government support includes billions of dollars in cash assistance, subsidized electricity and other benefits to companies. Recipients include steelmakers, coal miners, solar-panel manufacturers, and other producers of other goods including copper and chemicals. China’s continuing aid for unneeded factories is triggering a sharp rise in trade disputes and protectionist sentiment, especially in the U.S., where trade has emerged as one of the pivotal issues in the U.S. presidential election.