April–June April 1 – At Federal Hall, the United States House of Representatives attains its first quorum, and elects congressman Frederick Muhlenberg as the first Speaker of the House. April 6 – At Federal Hall, the United States Senate attains its first quorum, and elects John Langdon of Pennsylvania as its first President pro tempore. Later that day, the Senate and the House of Representatives meet in joint session for the first time, and the electoral votes of the first U.S. Presidential election are counted. General George Washington is certified as President-elect, and John Adams is certified as Vice-President elect. April 7 – Selim III (1789–1807) succeeds Abdul Hamid I (1773–1789) as Ottoman Sultan. April 21 – John Adams takes office as the first vice president of the United States, and begins presiding over the United States Senate. thumb|right| April 28: Mutiny on the Bounty. April 28 – Mutiny on the Bounty: Fletcher Christian leads the mutiny on the British Royal Navy ship against Captain William Bligh, in the Pacific Ocean. thumb|right| April 30: George Washington, inaugurated as the First President of the United States. April 30 – George Washington is inaugurated at Federal Hall in New York City, beginning his term as the first president of the United States. May 5 – In France, the Estates-General convenes for the first time in 175 years, taken as the start of the French Revolution (1789–1799). June – The Inconfidência Mineira is the first attempt at Brazilian independence from Portugal. June 17 – In France, representatives of the Third Estate at the Estates-General declare themselves the National Assembly. June 20 – The Tennis Court Oath is taken in Versailles. June 23 – Louis XVI of France makes a conciliatory speech urging reforms to a joint session, and orders the three estates to meet together.
april–june april 1 – at federal hall the united states house of representatives attains its first quorum and elects congressman frederick muhlenberg as the first speaker of the house april 6 – at federal hall the united states senate attains its first quorum and elects john langdon of pennsylvania as its first president pro tempore later that day the senate and the house of representatives meet in joint session for the first time and the electoral votes of the first us presidential election are counted general george washington is certified as president-elect and john adams is certified as vice-president elect april 7 – selim iii (1789–1807) succeeds abdul hamid i (1773–1789) as ottoman sultan april 21 – john adams takes office as the first vice president of the united states and begins presiding over the united states senate thumb|right| april 28 mutiny on the bounty april 28 – mutiny on the bounty fletcher christian leads the mutiny on the british royal navy ship against captain william bligh in the pacific ocean thumb|right| april 30 george washington inaugurated as the first president of the united states april 30 – george washington is inaugurated at federal hall in new york city beginning his term as the first president of the united states may 5 – in france the estates-general convenes for the first time in 175 years taken as the start of the french revolution (1789–1799) june – the inconfidência mineira is the first attempt at brazilian independence from portugal june 17 – in france representatives of the third estate at the estates-general declare themselves the national assembly june 20 – the tennis court oath is taken in versailles june 23 – louis xvi of france makes a conciliatory speech urging reforms to a joint session and orders the three estates to meet together