Sir Alexander Cadogan succeeds Sir Robert Vansittart as permanent under-secretary at the British Foreign Office; Vansittart is "kicked upstairs" by being given the new and unimportant office of Chief Diplomatic Advisor to the Government.
Sir Nevile Henderson, British Ambassador to Germany, presents a proposal to Hitler for an international consortium to rule much of Africa (in which Germany would be assigned a leading role) in exchange for a German promise never to resort to war to change her frontiers; Hitler rejects the British offer.
March 12 – Anschluss: German troops occupy Austria; annexation is declared the following day.
March 14 – French Premier Léon Blum reassures the Czechoslovak government that France will honor its treaty obligations to aid Czechoslovakia in event of German invasion.
In a result that astonished even Hitler, the Austrian electorate in a national referendum approved Anschluss by an overwhelming 99.73%.
April 16 – London and Rome sign an agreement that sees Britain recognise Italian control of Ethiopia in return for an Italian pledge to withdraw all its troops from Spain at the conclusion of the civil war there.
April 18 – First appearance of Superman. The date Action Comics #1 was published (June Cover) according to court documents released during the legal battle over the rights to Superman.
General Ludwig Beck, Chief of the German Army's General Staff, submits a memorandum to Hitler opposing Fall Grün (Case Green), the plan for a war with Czechoslovakia, under the grounds that Germany is ill-prepared for the world war likely to result from such an attack.
May 23 – Temporarily stymied by the Czechoslovak mobilization and international diplomatic unity in the face of German demands over the Sudetenland, Hitler orders the Foreign Office to tell the Czechoslovaks that he has no demands on their territory. The world at large mistakenly believes the crisis is averted.
July 5 – The Non-Intervention Committee reaches an agreement to withdraw all foreign volunteers from the Spanish Civil War. The agreement is respected by most Republican foreign volunteers, notably by those from England and the United States, but is ignored by the governments of Germany and Italy.
July 6 – The Evian Conference on Refugees is convened in France. No country in Europe is prepared to accept Jews fleeing persecution and the United States will only take 27,370. The prospect for European Jewry looks bleak.
July 22 – Britain rejected a proposal from its ambassador in Berlin, Nevile Henderson, for a four power summit on Czechoslovakia consisting of Britain, France, Germany and the U.S.S.R. London would under no circumstances accept the U.S.S.R. as a diplomatic partner.
September 4 – During the ceremony marking the unveiling of a plaque at Pointe de Grave, France celebrating Franco-American friendship, American Ambassador William Bullitt in a speech states, "France and the United States were united in war and peace", leading to much speculation in the press that if war did break out over Czechoslovakia, then the United States would join the war on the Allied side.
September 6 – What eventually proves to be the last of the "Nuremberg Rallies" begins. It draws worldwide attention because it is widely assumed Hitler, in his closing remarks, will signal whether there will be peace with or war over Czechoslovakia.
September 9 – U.S. President Franklin D. Roosevelt disallows the popular interpretation of Bullitt's speech at a press conference at the White House. Roosevelt states it is "100% wrong" the U.S. would join a "stop-Hitler bloc" under any circumstances, and makes it quite clear that in the event of German aggression against Czechoslovakia, the U.S. would remain neutral.
September 12 – Hitler makes his much-anticipated closing address at Nuremberg, in which he vehemently attacks the Czech people and President Beneš. American news commentator Hans von Kaltenborn begins his famous marathon of broadcast bulletins over the CBS Radio Network with a summation of Hitler's address.
September 13 – The followers of Konrad Henlein begin an armed revolt against the Czechoslovak government in Sudetenland. Martial law is declared and after much bloodshed on both sides order is temporarily restored. Neville Chamberlain personally sends a telegram to Hitler urgently requesting that they both meet.
September 17 – Neville Chamberlain returns temporarily to London to confer with his cabinet. The Russian army masses along the Ukrainian frontier. Rumania agrees to allow Russian soldiers free passage across her territory to defend Czechoslovakia.
During a meeting between Neville Chamberlain and the recently elected Premier of France, Édouard Daladier, and Daladier's Foreign Minister, Georges Bonnet, it becomes apparent neither the English nor the French governments are prepared to go to war over the Sudetenland. The Soviet Union declares it will come to the defence of Czechoslovakia only if France honours her commitment to defend Czech independence.
Mussolini makes a speech in Trieste, Italy where he indicates that Italy is supporting Germany in the Sudeten crisis.
In the early hours of the day, representatives of the French and British governments call on Czechoslovak President Edvard Beneš to tell him France and Britain will not fight Hitler if he decides to annex the Sudetenland by force. Late in the afternoon the Czechoslovak government capitulates to the French and British demands.
Unable to survive the previous day's capitulation to the demands of the English and French governments, Czechoslovak premier Milan Hodža resigns. General Jan Syrový takes his place.
Neville Chamberlain arrives in the city of Bad Godesberg for another round of talks with Hitler over the Sudetenland crisis. Hitler raises his demands to include occupation of all German Sudeten territories by October 1. That night after a telephone conference, Chamberlain reverses himself and advises the Czechoslovaks to mobilize.
Sir Eric Phipps, British Ambassador to France, reports to London, "all that is best in France is against war, almost at any price", being opposed only by a "small, but noisy and corrupt, war group". Phipps's report creates major doubts about the ability and/or willingness of France to go to war.
At 1:30 AM, Adolf Hitler and Neville Chamberlain conclude their talks on the Sudetenland. Chamberlain agrees to take Hitler's demands, codified in the Godesberg Memorandum, personally to the Czech Government. The Czech Government rejects the demands, as does Chamberlain's own cabinet. The French Government also initially rejects the terms and orders a partial mobilizaton of the French army.
September 26 – In a vitriolic speech at Berlin's Sportpalast, Hitler defies the world and implies war with Czechoslovakia will begin at any time.
September 28 – As his self-imposed October 1 deadline for occupation of the Sudetenland approaches, Adolf Hitler invites Italian Duce Benito Mussolini, French Premier Edourd Deladier, and British Prime Minister Neville Chamberlain to one last conference in Munich. The Czechs themselves are not invited.
Colonel Graham Christie, assistant British military attaché in Berlin, is told by Carl Friedrich Goerdeler that the mobilization of the Royal Navy has badly damaged the popularity of the Nazi regime, as the German public realizes that Fall Grün is likely to cause a world war.
Munich Agreement: German, Italian, British and French leaders agree to German demands regarding annexation of the Sudetenland in Czechoslovakia. The Czechoslovak government is largely excluded from the negotiations and is not a signatory to the agreement.
October 1 – German troops march into the Sudetenland. The Polish government gives the Czech government an ultimatum stating that Zaolzie region must be handed over within twenty-four hours. The Czechs have little choice but to comply. Polish forces occupy Zaolzie.
October 18 – The German government expels 12,000 Polish Jews living in Germany; the Polish government accepts 4,000 and refuses admittance to the remaining 8,000, who are forced to live in the no-man's land on the German-Polish frontier.
November 9 – Holocaust – Kristallnacht: In Germany, the "night of broken glass" begins as Nazi activists and sympathizers loot and burn Jewish businesses (the all night affair sees 7,500 Jewish businesses destroyed, 267 synagogues burned, 91 Jews killed, and at least 25,000 Jewish men arrested).
November 12 – French Finance Minister Paul Reynaud brings into effect a series of laws aiming at improving French productivity (thus aiming to undo the economic weaknesses which led to Munich), and undoes most of the economic and social laws of the Popular Front.
The Czechoslovak parliament elects Emil Hácha as the new president of Czechoslovakia.
Benito Mussolini and his Foreign Minister Count Galeazzo Ciano order "spontaneous" demonstrations in the Italian Chamber of Deputies, demanding that France cede Tunisia, Nice, Corsica and French Somaliland to Italy. This begins an acute crisis in Franco-Italian relations that lasts until March 1939.
December – President Roosevelt agrees to loan $25 million to Chiang Kai-shek, cementing the Sino-American relationship and angering the Japanese government.
December 1 – Slovakia granted the status of an autonomous state under the Catholic priest Fr. Joseph Tiso.
December 6 – German Foreign Minister Joachim von Ribbentrop visits Paris, where he is allegedly informed by French Foreign Minister Georges Bonnet that France now recognizes all of Eastern Europe as being in Germany's exclusive sphere of influence. Bonnet's alleged statement (Bonnet always denied making the remark) to Ribbentrop is a major factor in German policy in 1939.