The Dutch commandant of Cape Town surrenders to British forces. On January 10, formal capitulation is signed under the Treaty Tree in Papendorp (modern-day Woodstock).
March 23 – Explorers Lewis and Clark and their Corps of Discovery, having reached the Pacific Ocean after traveling through the Louisiana Purchase, begin their journey home.
March 28 – Washington College (modern-day Washington & Jefferson College) is chartered by the Pennsylvania General Assembly.
March 29 – Construction is authorized of the National Road, the first United States federal highway.
March 30 – The Napoleonic Kingdom of Naples is proclaimed.
↑Vajnági Márta: A Német Nemzet Szent Római Birodalma. In A kora újkor története. Szerk. Poór János. Budapest: Osiris. 2009. 188. o. = Osiris Tankönyvek, ISBN9789632760131