"Should China succeed, it doesn't imply that America will be in actual decline. China has been growing faster than America — which is expected for a country that is still "catching up", so it feels like the US has been out-paced. Plus, the 2008 financial crisis has added hardship and unemployment that have exacerbated this feeling. Of course, there are industries where the U.S. has lost manufacturing jobs to cheaper countries like China. At the same time, it has gained in higher skilled jobs as American companies are a significant part of the foreign firms that produce more than half of China's exports."

http://www.bbc.co.uk/news/business-23456018