June 3: Franz Rademacher proposes the Madagascar Plan. - Weather Bureau transferred to the Department of Commerce. - Paris is bombed by the Luftwaffe for the first time.
June 4: The Dunkirk evacuation ends - British and Dutch forces complete evacuating 300,000 troops from Dunkirk in France to England. - Winston Churchill tells the House of Commons of the United Kingdom, "We shall not flag or fail. We shall fight on the beaches... on the landing grounds... in the fields and the streets.... We shall never surrender."
June 9: The British Commandos are created.
June 10: Italy declares war on France and the United Kingdom. - U.S. President Franklin D. Roosevelt denounces Italy's actions with his "Stab in the Back" speech during the graduation ceremonies of the University of Virginia. - Canada declares war on Italy. - Norway surrenders to German forces. - The French government flees to Tours. - Marcus Mosiah Garvey died of a stroke on June 10, 1940
June 12: 13,000 British and French troops surrender to Field Marshal Erwin Rommel at St. Valery-en-Caux.
June 13: Paris is declared an open city.
June 14: The Soviet Union annexes three Baltic States which are Estonia, Latvia and Lithuania. This is the most popular date to be said when the term Soviet Empire was coined. - The French government flees to Bordeaux and Paris falls under German occupation. - U.S. President Franklin D. Roosevelt signs the Naval Expansion Act into law, which aims to increase the United States Navy's tonnage by 11%. - A group of 728 Polish political prisoners from Tarnów become the first residents of the Auschwitz concentration camp.
June 15: Verdun falls to German forces.
June 16: The Churchill war ministry in the United Kingdom offers a Franco-British Union to Paul Reynaud, Prime Minister of France, in the hope of preventing France from agreeing to an armistice with Germany, but Reynaud resigns when his own cabinet refuses to accept it. - The Sturgis Motorcycle Rally is held for the first time in Sturgis, South Dakota.
June 17: Philippe Pétain becomes Prime Minister of France and immediately asks Germany for peace terms. - The Soviet Army enters the Baltic states of Estonia, Lithuania and Latvia. - Operation Ariel begins - Allied troops start to evacuate France, following Germany's takeover of Paris and most of the nation. - RMS Lancastria, serving as a troopship, is bombed and sunk by Luftwaffe Junkers Ju 88 aircraft while evacuating British troops and nationals from Saint-Nazaire in France with the loss of at least 4,000 lives, the largest single UK loss in any World War II event, immediate news of which is suppressed in the British press.
June 18: Winston Churchill tells the House of Commons of the United Kingdom: "The Battle of France is over. The Battle of Britain is about to begin." - Appeal of 18 June: General Charles de Gaulle, de facto leader of the Free French Forces, makes his first broadcast appeal over Radio Londres from London rallying French Resistance, calling on all French people to continue the fight against Nazi Germany: "France has lost a battle. But France has not lost the war".
June 22: Second Armistice at Compiçgne: The French Third Republic and Nazi Germany sign an armistice ending the Battle of France in the Forest of Compiçgne, in the same Compagnie Internationale des Wagons-Lits railroad car used by Marshal Ferdinand Foch to agree the Armistice with Germany in 1918. This divides France into a Zone occupée in the north and west under the Military Administration in France (Nazi Germany) and a southern Zone libre, Vichy France.
June 23: German leader Adolf Hitler surveys newly defeated Paris in now occupied France.
June 24: United States politics: The Republican Party begins its national convention in Philadelphia and nominates Wendell Willkie as its candidate for president. - Vichy France signs armistice terms with Italy.
June 28: General Charles de Gaulle is officially recognized by Britain as the "Leader of all Free Frenchmen, wherever they may be."
June 30: German forces land in Guernsey, marking the start of the 5-year Occupation of the Channel Islands. - Federal government of the United States reorganisation: The Civil Aeronautics Administration is placed under the Department of Commerce. - The U.S. Food and Drug Administration (FDA) is placed under the Federal Security Agency. - The Fish and Wildlife Service is placed under the Department of the Interior. (source: Wikipedia)