History repeats itself, until the underlying problem is resolved. For the 22nd Century, it seemed Earth was entering a new age of chaos and hardship. The empires of the United States and Mexico had clashed a dozen times through proxies in the last 20 years alone, destabilizing much of Eurasia and Africa. Brazil and Poland, once tacid observers to America and Mexico’s conflict, have been drawn into it as direct actors. Brazil began siding more and more with the US after the wars for East Africa almost ended with the loss of the Uganda Tower, and the Civil War in China threatened to spill into Macau. To counter any potential US-Brazil entente in the Western Hemisphere, Mexico and its Latin American allies directly invaded Brazil in 2129, citing a desire to restore order after a series of riots broke out in Brasilia; riots engineered by Mexico. The Latin American states put down the riots, and then propped up a puppet government that quickly signed a non-aggression pact with Mexico. The Latin American states established satellite states in Southern Brazil, annexed neighboring territory, and now had access to the wealth of the Amazon. The Mexican strategy of destabilization by supporting popular uprisings and regionalist groups were partly intended to build alliances for Mexico, but mainly to distract the US around the world with costly wars just to hold onto partners they’d already won. With Brazil out of the picture, and America already busy with with civil wars in India and China, the US didn’t have time to aid a potential ally in South America. Mexico had proven itself to be a major player over the last 50 years, and had shown that the US wasn’t invulnerable. A number of powers closed ranks around Mexico, partly to spare themselves of any further destabilizing conflicts, but also due to a prevailing belief that Mexico would be the dominant power in the 22nd Century.
In the US, as with the rest of the Earth, the economic stagnation of the last 50 years had finally reached a tipping point by the late 2120s, with markets propped up by the reforms of the 2080s finally collapsing under their own weight. With the demand for goods unable to be met, fear of insurrection returned to the US. Mexicanos Libres party members began calling for autonomous status of the bankrupt Southwestern states, a prospect supported by Vice President David Castillo. The Second Martian Revolution, attempted to declare independence from the United States, but was quelled by ITC Chairman Lionell “Leo” Halvidar, one of the surviving first colonists of Mars. Following the Second Revolution, Halvidar announced his candidacy for the US Presidency, traveling to Earth to campaign directly to the American people on Terra. Halvidar, running on the new Union Party ticket, advocated for the US (and by extension all of Earth) to adopt the Quantum Economic Model, grant full integration of the colonies into the Union, and a undertake a phased population relocation of citizens and prospective citizens to the soon-to-be-habitable colonies on Venus. Halvidar, a former Terran, resonated with many disenfranchised people on Earth, and many of his speeches and appearances were viewed en masse around the Earth, and across the system. Colonials contacted and urged relatives on Earth to support Halvidar, while Mexican nationals, still furious over the deportations of the 2080s urged the people of the Southwest to stop Halvidar at all costs. The Mexicanos Libres party directly engaged Halvidar and the Union party more than any single group. The MLP was staunchly anti-colony, arguing that the inclusion of the colonies would drastically tip the balance of political power off-Earth, and leave the Mexican-Americans ignored and disenfranchised even more. Mexico, who supported the MLP, considered the colonies to be the single greatest threat to their future. So long as the American's access to space based resources is limited, and Mexican control of the Hispanosphere ensures a real chance of unseating the Americans as the dominant force on Earth, but if the Americans ever formally integrate the colonies into the Union, Mexico would be dwarfed by the US in terms of economy and population. It was for these reasons that the MLP received more money from Mexico in 2132 than during any other election, even supporting Conservative Party candidates to chip away at the Union-Progress coalition. On Election Day, 2132, Lionel Halvidar won 37.5% of the vote, and was the second choice of another 17.5% of voters, winning him a narrow victory, and resulting in the secession of four Southwestern states.
Ironically, Mexico did not anticipate this outcome, despite engineering similar events around the world. A Second Civil War in America would inevitably lead to a far worse war between the US and Mexico. With this in mind, Mexico sought to keep the conflict contained by building up its forces along the border and making regular contacts with the Americans, pledging non-intervention. Meanwhile, Mexican proxies ramped up their war efforts in Eurasia and Africa to keep American hands from finding Mexico's throat. Militant elements inside Mexico, had already begun to fund these separatists, and distribute nationalist propaganda across Mexico and the Latin American allies. Opposition to the moderate government under President Deandre Garcia, began to increase, as her administration continued to support an indirect approach to combat the Americans. Garcia's own generals began to oppose her, supporting a more direct approach against the Americans. One such general in the Mexican orbitals began running bombardment drills, and war games with his colleagues on Earth, without the President's permission. Despite what the leadership may want, Mexico seems ready to march to war.
In the colonies, the remnants of the revolutionaries broke up almost overnight at the promise of integration by one of their own, while colonial leaders prepared for what they feared most. The Planetary Guards of the colonies began running war games, while Venus Working Group did everything they could to accelerate the planet's declaration of habitability. Colonial organizations began moving to fund similar projects on Earth that had unified the colonies, beginning with teaching tours by colonial experts on post-scarcity quantum economics. The colonies may be getting ahead of themselves though; with civil war all but declared, and the Union Party with just barely a majority in Congress, integration will be a hard fought battle, but it may be the only one that can save Earth from an apocalyptic war.
Based on your North America and European Map, maybe this could work. Along with the original 50 states, the following would be included into the union:
Alberta, Antilles, Athabasca, Bahamas, Britain*, Cascadia, Cook, Cuba, Greenland, Guyanna, Hispaniola, Hudson, Jamaica, Keewatin, Manitoba, Newfoundland, New Brunswick, New Zealand, Nova Scotia, Nunavut, Ontario, Puerto Rico, Queensland**, Riverina**, Saskatchewan, Southwest Australia**, Superior, Tasmania**, Tlicho, Victoria** and Yukon.
* Based on the European Theater 2136 Map, Britain appears to be a single state that includes England, Ireland, Scotland and Wales. If the last three were admitted as single states, the flag would need to have 84 stars.
**Australia can be divided into 5 provinces instead of the current 7.
Queensland consists of its current borders along with the northern territory and the northern parts of Western Australia
Southwest Australia takes parts of South and West Australia
Riverina takes up most of New South Wales and parts of Southern Australia
Victoria has its current borders plus parts of Southern Australia
Tasmania remains exactly as it is today
Sorry, I don't mean to push the issue or tell you what do to, but every time I try to divide up the British and Australians based on current provincial divisions it always goes over 81 states. I am very interested in the US' position by this time and what states incorporate the union prior to the Aztlan Rebellion or the admission of the Colonies.
North America (Canada): Alberta, Athabasca, Cascadia, Cook, Hudson, Keewatin, Manitoba, Newfoundland, New Brunswick, Nova Scotia, Nunavut, Ontario, Saskatchewan, Superior, Tlicho and Yukon
Caribbean Sea: Antilles, Bahamas, Cuba, Hispaniola, Jamaica and Puerto Rico
Central and South America: Belize, Guyana and Panama
Atlantic and Europe: British Isles and Greenland
Australia and Oceania: Western Australia, Riverina, Tasmania and New Zealand
50+31= 81 States