The Election

A silly thing I thought up. Initially, I was going to show each individual party, but since there would've been almost one hundred I gave up, and instead decided to show coalitions.
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    During World War II, a successful Nazi invasion of Britain results in the British population halving, and the U.S. incorporating it directly (along with Canada). China never goes fully communist, and remains in a civil war (proxy war between the U.S. and the Soviet Union) until '59 when Aliens start to invade. Over the next fifty years, as humanity faces an existential threat against an enemy which aims to eradicate it, the U.S. and the U.S.S.R become close (by 2009, the USSR is democratic). When the last remnants of the alien force are finally kicked off in 2010, humanity's population is a third of what it previously was. The UN is already much stronger (having served as a human alliance during the war), and is slowly converted into an actual united Republic of Earth (this is helped along by the discovery of more races of aliens, some of whom also hate us, and some of whom pressure us to unite to use us as a proxy to attack the race which invaded us). Starting in 2018, every four years an election is held in every 'province', and each province elects a representative. The representatives vote amongst themselves to elect a president.
    43 elections, or 172 years later, Earth is again hugely prosperous, and is a rising power in an increasingly crowded solar system. For a space-faring civilization, culturally it's rather similar to the OTL 2000s (although the conservative Christians, Muslims, Hindus, and Buddhists now get along with one another most of the time)