Editing 1790 (section)

=== April&ndash;June ===
* [[April 10]] &ndash; The [[United States patent law|United States patent system]] is established.
* [[May 13]] &ndash; [[Battle of Reval]]: [[Gustav III of Sweden]] sends the battlefleet to eliminate the Russian squadron wintering at Reval ([[Estonia]]), but is defeated; 8 Russians, 130 Swedes are killed, up to 520 captured, 1 ship is burnt, another captured.
* [[May 17]]&ndash;[[May 18|18]] &ndash; [[Battle of Andros (1790)|Battle of Andros]]: An [[Ottoman Empire|Ottoman]]–[[Ottoman Algiers|Algerian]] fleet destroys the fleet of the Greek privateer [[Lambros Katsonis]].
* [[May 26]] &ndash; Congress passes an act to govern the creation of states from the "Southwest Territory", from which Tennessee, Alabama, and Mississippi will be formed.<ref name="Harper1790"/> 
* [[May 29]] &ndash; [[Rhode Island]] ratifies the [[United States Constitution]], and becomes the last of the [[Thirteen Colonies|13 original states]] to do so.<ref name="Harper1790"/>
* [[June 9]] &ndash; Royal assent is given to establishment of the port of [[Milford Haven]] in Wales.
* [[June 20]] &ndash; [[Compromise of 1790]]: Thomas Jefferson, [[James Madison]], and [[Alexander Hamilton]] come to an agreement: Madison agrees to not be "strenuous" in opposition for the assumption of state debts by the federal government; Hamilton agrees to support the capital site being above the Potomac.
* [[June 23]] &ndash; The alleged ''[[London Monster]]'' is arrested in London; he later receives 40 years for 10 assaults.