The third great war erupted in 2102, June 7th after the newly formed Western Allied Nations, AKA W.A.N. had come into full effect. Securing ties in between all countries of the West, much of Northern Africa, Russian and the Middle Eastern Nations. Tensions had begun to spark over the severe lack of world resources such as simple metals like bauxite, iron and copper had dropped to all time lows. As well as other fossil fuels, such as oil. Though historically its not clear what sparked the event, along the Tajikistan and newly reformed Chinese borders a major conflict broke out between French and Chinese forces which quickly turned into a massive conflict that spread all the way to the Mediterranean sea. Politicians debated and argued about who shot first, but after five years of advancing Chinese forces which had begun to push into Israel, three high yield nuclear weapons were detonated. One at the W.A.N. headquarters in Geneva, the second in London and the third in a passenger plane above Hong Kong. The war came to a grinding halt, as the first nuclear device detonated during the Chinese invasion into the heart of Israel. The source of the nuclear detonations and who was responsible is unknown to this day.
There was other activity in the Americas, a small civil war had broken out and had consumed much of the nation between the Rocky Mountains and the Appalachians. A conflict between Brazil and Mexico had begun to simmer down over resource rights which had ended up burning down many forests after a small handful of nuclear devices were used in remote regions between armies by still unknown parties.
Within the next few months peace was finally declared on October 15th, 2109. The worlds resources had come to a halt and there was no more oil, many nuclear power plants had been decommissioned during the war by covert operations on both sides and everyone knew that this was the end. Over the next decade the W.A.N. had reformed and accepted a majority of the worlds nations into its doors. Though the bitterness was left by the war, humanity had no choice but to find a solution. Colonization was already underway before the war on both Mars and the Moon and it was decided that these would become the primary efforts of the W.A.N. to keep a common great goal for the many united nations to strive for.
It was on September 2nd the next year, 2110 tragedy fell across the world. A massive solar flare wiped out the entire Eastern hemispheres electronics, satellites came raining down one at a time and the global effort was hampered, but only momentarily. Not but a few months later a group of scientists backed by the W.A.N. announced their discovery and ability to begin creating fusion power. Their initial devices the size of most stadiums, but providing immense near limitless power across the world. Efforts shifted to creating a more global electrical grid, hastening the massive efforts on off world colonization. Over the next year many events transpired, the discovery of the Ozone layers massive holes and severe atmospheric depletion from both humanities pollution and effects felt by the Sun. But by this point, much of the worlds technology involving space travel had advanced at an astonishing rate, allowing for millions to be transported in days to new homes. Mass inspections imposed on much of the world, rooting out any who would not be fit for space travel. In the end, out of the eleven billion, roughly eight-hundred million would be left on Earth, unable or refusing space travel, however few refused such an opportunity.
And so it began, the great migration, the mass exodus to new worlds. Over the next few decades cities became sparse with life, what was left of the W.A.N. had begun massive projects to recycle hundreds of thousands of existing structures for material. This began to shape the world as it is today, creating a now sparse Earth with a similar soul, but far diminished.