OTL until June 3, 1936. Completely OTL until
Pre-World War II[]
1920s[]
1920[]
January 10 Establishment of the League of Nations.
1921[]
November 9 The Italian National Fascist Party is established.
1922[]
October 28 - 29 The March on Rome. It ends with the beginning of the fascist regime in the Kingdom of Italy.
October 29 Benito Mussolini is appointed as Italian prime minister.
December 30 The Soviet Union is created.
1927[]
April 12 The Shanghai Massacre.
August 1, 1927 - December 22, 1936 The Chinese Civil War.
1928[]
May 3 - 11 The Jinan Incident.
1929[]
August 1, 1929 - March 9, 1933 The Great Depression.
October 24 - 29 The Wall Street Crash.
December 1, 1929 - December 20, 1934 Early German development of rocket technology.
1930s[]
1931[]
September 18, 1931 - February 18, 1932 The Mukden Incident.
September 18, 1931 - February 26, 1932 The Japanese Invasion of Manchuria.
1932[]
February 27 Imperial Japan takes control of Manchuria.
March 1 Establishment of the Japanese puppet state, Manchukuo.
1933[]
January 1 - May 31 The Defense of the Great Wall.
January 30 Nazi Germany is founded.
March 27 The Empire of Japan leaves the League of Nations.
May 15 Formation of the Luftwaffe.
October 19 Germany leaves the League of Nations.
September 12 Leó Szilárd conceives the idea of nuclear chain reactions.
1934[]
January 26 Signing of the German-Polish Non-Aggression Pact.
February 12 - 16 The Austrian Civil War.
September 18 The Soviet Union joins the League of Nations.
December 21, 1934 - March 17, 1942 Military development of the Aggregat rockets.
1935[]
March 1 Walther Wever becomes Chief of Staff for the Luftwaffe.
March 16 Formation of the Wehrmacht.
June 1 Formation of the Kriegsmarine.
October 3, 1935 - May 9, 1936 The Abyssinia Crisis.
October 3, 1935 - February 19, 1937 The Second Italo-Ethiopian War.
1936[]
June 3 Walther Wever's Heinkel He 70 is properly examined and its aileron gust locks are removed during preflight checks in Dresden. He and his flight engineer safely fly to Berlin. POD
July 17 The Spanish Coup of July 1936.
July 17, 1936 - April 1, 1939 The Spanish Civil War.
1937[]
July 7 - 9 The Marco Polo Bridge Incident.
July 7, 1937 - September 13, 1943 The Second-Sino Japanese War.
December 11 Italy leaves the League of Nations.
1938[]
March 13 Annexation of Austria by Nazi Germany.
July 29 - August 11 The Battle of Lake Khasan.
July 29, 1938 - September 16, 1939 Soviet-Japanese border conflicts.
September 30 Signing of the Munich Agreement. This allows Germany to annex the Czechoslovak Sudetenland in order to peacefully appease Hitler.
1939[]
January 25 A uranium atom is split for the first time at Columbia University, New York.
March 14 Establishment of the Slovak Republic.
March 23 Signing of the German-Romanian Treaty for the Development of Economic Relations between the Two Countries.
March 23 - 31 The Slovak-Hungarian War.
April 3 Nazi Germany begins planning on Fall Weiss (the Invasion of Poland).
April 7 - 12 The Italian Invasion of Albania.
April 22 Founding of the German Nuclear Weapons Program (Uranprojekt).
April 28 Germany denounces the German-Polish Non-Aggression Pact.
May 22 Signing of the Pact of Steel.
August 2 The Einstein-Szilárd Letter is sent to Franklin D. Roosevelt reporting of Nazi Germany's nuclear weapons program.
August 23 Signing of the Molotov-Ribbentrop Pact.
September 1 Germany declares war on Poland.
World War II[]
September 1 - October 6 The Invasion of Poland.
September 1 Norway and Switzerland declare neutrality.
September 2 Nazi Germany annexes the Free City of Danzig.
September 3 The United Kingdom, France, Australia, and New Zealand declare war on Germany.
September 3, 1939 - The Battle of the Atlantic.
September 17 The Soviet Union declares war on Poland.
September 17 - October 6 The Soviet Invasion of Poland.
October 8 Poland is captured by Nazi Germany and the Soviet Union. The nation is split between them.
November 30 The Soviet Union declares war on Finland.
November 30, 1939 - March 13, 1940 The Winter War.
1940s[]
1940[]
March 12 Signing of the Moscow Peace Treaty.
April 9 Nazi Germany declares war on Denmark and Norway.
April 9 The German Invasion of Denmark
April 9 - June 10 Operation Weserübung.
April 9 Germany occupies Denmark.
May 10 Sir Winston Churchill begins his position as the UK prime minister.
May 10 - 17 The Battle of the Netherlands.
May 10 - 28 The Battle of Belgium.
May 10 The German Invasion of Luxembourg. They are able to take the country.
May 10 - June 25 The Battle of France.
May 17 Germany occupies the Netherlands.
May 28 Germany occupies Belgium.
June 10 Germany occupies Norway.
June 22 Signing of the Armistice of 22 June 1940.
June 22 France surrenders and Germany and Italy occupy their parts of the nation.
November 6 Adolf Hitler decides to cancel Operation Barbarossa and to have it carried out after the expiration of the Molotov-Ribbentrop Pact. POD
1941[]
January 20 Franklin D. Roosevelt is inaugurated as president of the United States for the third time.
December 7 Hirohito cancels the Attack on Pearl Harbor upon persuasion by Isoroku Yamamoto. POD
1942[]
March 18, 1942 - V-2 rocket test launches.
November 10 - 27 Case Anton.
November 27 Germany and Italy take Vichy France. They are able to find the French naval fleet before most of them are scuttled and capture them. POD
1943[]
August 16 - September 13 The Battle of Guilin-Liuzhou. The final battle of the Second Sino-Japanese War.
September 14 Establishment of Japanese China.