(Erin Schaff | New York Times file photo) President Donald Trump and Chinas's President Xi Jinping at the G20 Summit in Osaka, Japan, June 29, 2019. "The No. 1 reason China has made such stark progress in geopolitical terms is that its rival just endured a bad decade by virtually every measure. While China takes more steps forward than backward, the United States is moving slowly in reverse," writes David Leonhardt.