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when the Kwantung Army of the Empire of Japan invaded Manchuria immediately following the Mukden Incident. After the war, the Japanese established the puppet state of Manchukuo. https://en.wikipedia.org/wiki/Japanese_invasion_of_Manchuria
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Japan withdrew from the League in 1933 after being censured by the League of Nations for the Japanese invasion of Manchuria faculty.virginia.edu/setear/courses/ilbfrnaf/leagueex.ht
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some nine months after Adolf Hitler was appointed chancellor of Germany, the German government announced its withdrawal from the League of Nations. The ostensible reason was the refusal of the Western powers to acquiesce in Germany's demands for military parity. https://www.wdl.org/en/item/11598
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Congress passed the first Neutrality Act prohibiting the export of “arms, ammunition, and implements of war” from the United States to foreign nations at war and requiring arms manufacturers in the United States to apply for an export license.https://history.state.gov/milestones/1921-1936/neutrality-acts
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The Second Sino-Japanese War was a military conflict fought primarily between the Republic of China and the Empire of Japan from July 7, 1937, to September 2, 1945. It began with the Marco Polo Bridge Incident in 1937 in which a dispute between Japanese and Chinese troops escalated into a battle. Wikipedia
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Anschluss refers to the annexation of Austria into Nazi Germany on 12 March 1938. The word's German spelling, until the German orthography reform of 1996, was Anschluß and it was also known as the Anschluss Österreichs Wikipedia
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The German occupation of Czechoslovakia began with the German annexation of Czechoslovakia's border regions known collectively as the Sudetenland, under terms outlined by the Munich Agreement Wikipedia
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The Molotov–Ribbentrop Pact, officially known as the Treaty of Non-aggression between Germany and the Union of Soviet Socialist Republics, was a neutrality pact between Nazi Germany and the Soviet Union signed in Moscow on 23 August 1939 by foreign ministers Joachim von Ribbentrop and Vyacheslav Molotov, respectively. Wikipedia
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The Invasion of Poland, known in Poland as the September Campaign or the 1939 Defensive War, and in Germany as the Poland Campaign, was an invasion of Poland by Germany that marked the beginning of World War II. Wikipedia
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The Munich Agreement or Munich Betrayal was an agreement concluded at Munich, September 29, 1938, by Germany, Great Britain, France and Italy. It provided "cession to Germany of the Sudeten German territory" of Czechoslovakia Wikipedia
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The Battle of France, also known as the Fall of France, was the German invasion of France and the Low Countries during the Second World War
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After the occupation of France by Germany, Britain knew it was only a matter of time before the Axis power turned its sights across the Channel. And on July 10, 120 German bombers and fighters struck a British shipping convoy in that very Channel, while 70 more bombers attacked dockyard installations in South Wales. https://www.history.com/this-day-in-history/the-battle-of-britain-begin