MANY LIBERAL USA DEMOCRATS HAD FELT FOR YEARS THAT CHINA AND THE UNITED STATES WERE HEADING TOWARD WAR.  For years USA politicians had done all they could to appease China with good trade deals and by allowing China to steal USA jobs and technology.  President Trump cut into this cycle of war.
Source @ http://boomerspeaks.com/273893/885749.html .
The reason for fearing was sometimes described as the Thucydides’s Trap, a deadly pattern of structural stress that results when a rising power (China) challenges an existing one (USA). This phenomenon is as old as history itself. It was described by the historian Thucydides. The Peloponnesian War that devastated ancient Greece, Thucydides explained: “was the rise of Athens and the fear that this instilled in Sparta that made war inevitable.”
Over the past 500 years, these conditions of conflict between a new power and an older one, have occurred sixteen times. War broke out in twelve of them. Prior to President Trump, an unstoppable China approached an immovable America while both Xi Jinping and Donald Trump promised to make their countries “great again.” This seventeenth case looked grim until President Trump got China to begin scaling back its and accept becoming number two in the Pacific a trade conflict and begin to end cyberattacks and hostilities at sea that could soon escalate into all-out war. In Destined for War, the eminent Harvard scholar Graham Allison explains why Thucydides’s Trap is the best lens for understanding U.S.-China relations in the twenty-first century. Through uncanny historical parallels and war scenarios, he shows how close we are to the unthinkable. Yet, stressing that war is not inevitable (with President Trump leading the nation), Allison also reveals how clashing powers have kept the peace in the past — and what painful steps the United States and China must take to avoid disaster today.   
Thucydides’s Trap? : Historical Interpretation, Logic of Inquiry, and the Future of Sino-American Relations.  Link to book -> https://linksynergy.walmart.com/deeplink?id=w2VGpneWfTE&mid=2149&murl=https%3A%2F%2Fwww.walmart.com%2Fip%2FThucydides-s-Trap-Historical-Interpretation-Logic-of-Inquiry-and-the-Future-of-Sino-American-Relations-9780472131709%2F866318099 .