1918: World War I ends in Allied victory. Centurion’s life-pod enters Earth’s dimension and lands west of Freedom City.
1938: First public appearance of Centurion. Justice Society of America founded by mystery men on the East Coast.
1939: Germany invades Poland, triggering World War II, the first major war to feature the use of superhumans in combat.
1941: U.S. enters World War II after their naval base at Pearl Harbour is attacked. Dr. Tomorrow arrives from the future the very next day, with the prediction that the Axis will win if history as he knows it remains unchanged. President Roosevelt announces formation of the Liberty League.
1942: Japanese submarine I-14 fires several shells at Fort Breckinbridge, near Emerald City. As a result, the Victory Squadron is formed.
1945: World War II ends in Allied victory.
1950: HUAC hearings force conscientious disbanding of the JSA.
1955: HUAC hearings force conscientious disbanding of the Liberty League.
1960: AEGIS formed. British government forms the Ministry of Powers to monitor superhuman activity.
1965: The First Terminus Invasion. The recently-formed Freedom League and Dr. Atom successfully send Omega back.
1969: First lunar landing from Earth, which attracts attention from Farside City.
1971:The Big Brain founds the Fraternity of Evil (F.O.E) in Emerald City.
1984: Franklin Moore elected Mayor of Freedom City. His first act was to make superheroes who don't directly work for the U.S. government or military illegal within the city. Freedom League disbanded.
1985: The vigilante group FORCE Ops is formed, fighting the corruption spawned by Mayor Moore.
1986: The Crisis of Infinite Earths, which resulted in the destruction of most of the multi-verse. Earth-Prime is the sole surviving timeline.
1991: Soviet Union dissolves, ending the Cold War in favour of the West. First appearance of Spiderman in New York.
1992: Michael O'Connor Jr. is elected as Mayor of Freedom City by the biggest landslide in the city's history. It is known that the successful exposure of the total corruption of the Moore administration by FORCE Ops was the key factor. They failed to get any evidence of Moore's own corruption, but so many of his staff were exposed that he never stood a chance. His whereabouts are currently unknown.
1993: Second Terminus Invasion. Centurion sacrifices himself to force Omega's retreat. Mayor O'Connor reacts by repealing the Moore Act, making non-government superheroes legal within Freedom City again. Governments around the world also loosen their restrictions on superhumans to varying degrees, if they had any in the first place.
1994: Freedom League reforms once again.
1995: The experimental space-plane America is saved by Superman in his first appearance. First appearances of Batman, Flash, Green Lantern and Wonder Woman. Justice League formed.
1997: Tabaluga appears in Berlin, and becomes a major celebrity in Europe, particularly in German-speaking areas.
2001: 9/11 terror attacks destroy the Twin Towers. Most mystics sense a major shift in the zeitgeist, a true end of an era.
2005: 7/7 terror attack on London's transport system, and first appearance of the new Britannia. The Ministry of Powers forms a new super-team, Heroes for Britain, but Britannia refuses to join them.
2006: The Infinite Crisis, triggered by parallel versions of Superman and Lex Luthor, brings about the multi-verse's resurrection. Superhuman Registration Act in the U.S. splits the caped community in two. As a result, the Initative is born, creating a government-controlled super-team in every State of the Union.
2008: Darkseid triggers the Final Crisis, conquering and nearly consuming all creation. Every living super able to fight is involved, without exception. Batman has no choice but to violate his two most sacred oaths, by shooting and killing Darkseid, seemingly perishing in the attempt. Vandal Savage is exposed as Cain, the First Murderer. Renee Montoya manages to steal the Spear of Destiny from Cain, using it to help the Spectre and turn the tide of the Crisis.
2010: Secret Invasion. The Skrull race used the Initative to put one of their kind in every state. Norman Osborn, head of the Initative, is finally exposed as mentally unstable. Superhuman Registration Act repealed.
2012: Frank Castle AKA "The Punisher" dies while successfully killing Wilson Fisk, the "Kingpin" of New York. AEGIS were either unable or chose not to prevent the news from reaching the public, which inspired vigilantes across the globe.
2013: First appearance of the Griffin in London. Ponies from Equestria arrive on Earth by accident. Griffin and Ms. Magus successfully prevent a religious cult from killing the ponies during their accidental visit to Manhattan.