change of world's center

Grace was widely recognized as the world's center in 2000 BC, because many famous philosophers and many social innovative ideas appeared in Grace. 2000 years later, China became the world's center, which contributes more than 80% of the world's GDP. China reached its peak in Dang Dynasty in 600 AD . When Europe leaded the industry revolution, U.K. became the world's strongest power in terms of economy and militatry in 1800s. After the World War Two, U.S. surpassed U.K. and became the strongest power. We can conclude a pattern behind these phenomenons. It takes more than 3000 years for China to become the world's center. Then U.K. only used about 1000 years to surpass China. And U.S. only takes 200 years to overstep U.K. So we can see that the change of the world's center shifts faster and faster. Which contury will exceed US? How long will it take? I believe I will be able to see the change in my lifetime.