Ideology is the beliefs and ideals held by a group of people that determines the group's actions and goals. Several political ideologies have grown worldwide, with each having a goal of how society should work and the best way to achieve that goal.
Communism made it's first true appearance on the world stage with the Bolsheviks of the Russian Empire during the Russian Empire. Despite their defeat, communism would live on, appearing in the Chinese Civil War, where General Zhu De lead the Communist Party of China to total victory and established the People's Republic of China. Zhu De preached "communism in one state" meaning that China mostly stayed out of the Cold War and focused on improving their own country. Quietly, communism began to spread into southeast Asia, with half of the governments there turning communist. Following the collapse of the Greater Union, China has begun to replace Russia's world position, and has become more involved in the spread of communism. Widespread unrest in 2015 and 2016 has led to communist revolutions in the Middle East and Siam, which has been supported by China. Pundits predict the beginning of a Second Cold War between communist China and capitalist America in the upcoming decades.
Devoirism is the equivalent of OTL fascism. It is a form a radical authoritarian nationalism that became popular in the defeated nations of World War I. Designed by a group of disillusioned French generals, politicians, and philosophers led by Phillipe Petain, devoirists (coming from the French word devoir, meaning "duty" in English) view a strong central totalitarian single-party state as necessary for any modern conflict. A strong dictator, backed by members of the governing party, leads the nation forge national unity and maintain a stable society. Citizens of the nation are expecting to serve the state to the best of their ability, whether it be working on infrastructure or total war. Devoirism rapidly gained popularity during the Great Depression, but following the defeat of devoirism in World War II and the relevation of the widespread discrimination and genocide against "enemies of the state", no major nations have used devoirism as their ideology since then.
Unitarianism is a combination of communism, anti-nationalist in the wake of the Great War, and Leon Trotsky's personal beliefs. The death of Lenin in the Russian Civil War led to him forming his own faction, the "Blue Army", that managed to win the war and take control of Russia. During the Great Depression, Trotsky perfected and outlined his ideology. With nationalism-fueled conflicts tearing the globe apart, Unitarianism was presented as the opposite of nationalism - a unified world. Unitarianism believes removing individualism, with one global economic class, one religion, eventually one ethnicity, eventually one unified human race. Trotsky believed that if this Unitarian global revolution didn't occur sooner than later, than Russia would become overwhelmed by the divided nations of the world. Trotsky's successor, Ivan Konev, attempted to hurry up the process by removing the families of Eastern Europe and replacing them with Russian families, with the Russian language and morals forced to be taught in school. Konev's attempts to weaken the United States - the main potential enemy of Russia - led to the Cold War, beginning in the 1960s. The closest Russia came to unifying the world was in the 1990s, when the nations of Eastern Europe were absorbed into Russia. It only lasted a few short years, as nationalists rose up in eastern Europe, while Unitarian Russia collapsed in 2003 in The Winter Coup and democratic, capitalist reforms being introduced. However, Unitarianism remains strong in areas such as the Middle East, where various factions clash over control of a potential Pan-Arabic state.