America progress through the 19th and early 20th centuries to become the largest economy in the world despite a civil war, various other conflicts with foreign powers, three presidential assassinations, and numerous economic and financial crises. These forces also helped global economic growth to bounce back strongly from two world wars and a Great Depression to reach record levels in the post-war decades.
The world economy will more than double in size between now and 2050, far outstripping population growth:
Emerging markets will dominate the world's top ten economies (GDP at PPP):
By 2050 we project China will be the largest economy in the world by a significant margin, while India could edge past the US into second place and Indonesia have risen to fourth place. The EU27’s share of global GDP will have fallen to below 10%.