The Cold War between the economic empire of the West and the socialist tyrannies of the East made it seem as if the future would belong to the coalition with the best industrial machine and largest military. In the 21st century though the industrial machine has been traded off to China, and ICBM's and armies haven't managed to settle the brewing low-tech conflicts of both empires with the Muslim world.
The scene above is Moscow at Eid al-Fitr, as Muslims protest the lack of additional mosques with street prayers. But it could just as easily be London, Paris, New York, or dozens of other cities. While the two empires were stacking up ICBM's, the Muslim world was stacking up babies. The empires suffer from low birth rates, and are experiencing an invasion that they have no defense against.