The United States is in a downward trajectory from being an hegemony, sole world power. Currently China may have matched the United States and if not now will soon do so. More important, China will surly surpass the United States in the year 2030. A number of factors have brought this about. To have this explained to you, I recommend three options for you to consider:

1. Start by listening to this podcast: Alfred McCoy, the author of “Policing America’s Empire: The United States, the Philippines, and the Rise of the Surveillance State”. He joins us to discuss his new book “In the Shadows of the American Century: The Rise and Decline of U.S. Global Power” and how much Donald Trump’s ignorance and incompetence is accelerating America’s decline and China’s rise, and whether a less powerful, more generous and collaborative America could co-exist in a world without a single hegemon.
2. Another website, The Intercept, audio is recommended: https://soundcloud.com/the_intercept/intercepted-podcast-extra-alfred-mccoy
3. Consider buying this book: In the Shadows of the American Century: The Rise and Decline of US Global Power (Dispatch Books) by Alfred W. McCoy a distinguished historian at the University of Wisconsin.The book is due to come out September 12, 2017.   Wikipedia credentials for Dr. Alfred W. McCoy : https://en.wikipedia.org/wiki/Alfred_W._McCoy