The United States vs. China was the 2017 trade battle that never materialized. But 2018 could be a different story. President Trump hammered China on the campaign trail, promising to get tough on trade. But his tune changed once in office, with fiery rhetoric giving way to a budding bromance with Chinese President Xi Jinping. Trump didn't follow through on his promise to label China a currency manipulator, and instead opened talks with Beijing on improving economic ties. He also put potentially inflammatory investigations on the back burner.