Chris Alonzo, President of Pietro Industries, checks the growth of mushrooms at his farm in Chester County in Pennylvania, the United States, July 9, 2018. in U.S. county of Chester in Pennylvania, July 9, 2018. While U.S. President Donald Trump sees an "economic enemy" in China, the northeastern U.S. county of Chester in Pennylvania sees an economic partner. (Xinhua/Wang Ying)