So what's happened in the next 50 years?
1. There is a new Egyptian empire that rules the middle east. The resolution of what was called the Middle Earth war, Egypt now holds sway over a vast array of land full of now worthless oil. The Middle Earth war ended 10 years ago, but the development of item two has lead to new dangerous rumblings from this new world power.
2. The Clausius Engine: People no longer drive cars. They utilize vehicles that are called Entropies. You would own an Entropy. Owning such a vehicle is a sign of wealth and status. Public transportation is now the norm, with all vehicles utilizing this engine which provides its own energy and puts out 0% emissions. The Clausius engine is a worldwide phenomenon, its limitless energy resource has lead to the end of various wars as well as the virtual elimination of hunger. The Clausius Engine was developed seven years ago by a consortium of scientist from all over the world, its patent was given freely by their charter to the world community.
3. India. Only half of India is now inhabitable, its population cut by 75% between radiation poisoning and disease. Thirty years ago war erupted between the former Pakistan and India which lead to a nuclear exchange that threatened the entire world. China now rules over the inhabitable areas of those two nations.
4. China: Twenty-nine years ago, communism fell in China. They have returned to their roots of Empire, the Chinese Empire now controls the remains of India and Pakistan, The Koreas, Japan, and Thailand. Korea, Japan and Thailand were not conquered with military might but economic. The absorption of those countries into China's economic block soon brought each to heel under the new empire. Only Japan retains any sense of independence.
5. The United States now has 2 new states in its Union, Puerto Rico and Old Mexico. Old Mexico covers a large portion of the former northern portions of Mexico. This was a political solution to the immigration battles of the 2020's.