4th » The United States Congress adopts the flag of the United States with 13 red and white stripes and one star for each state (then 20).
16th » The United States Senate ratifies the Rush-Bagot Treaty, establishing the border with Canada.
20th » The case of 'Ashford v Thornton' ends, with Abraham Thornton allowed to go free rather than face a retrial for murder, after his demand for trial by battle is upheld.
Famous Birthdays on April in 1818
4th » Thomas Mayne Reid, Irish-American author (d. 1883)
6th » Aasmund Olavsson Vinje, Norwegian journalist and poet (d. 1870)