Births on June 21

Nikolaus Nilles, German Catholic writer and teacher (d. 1907)

Nikolaus Nilles (21 June 1828–31 January 1907) was a Roman Catholic writer and teacher.

14 Apr

Webster's Dictionary
Noah Webster copyrights the first edition of his dictionary.
19 May

Tariff of 1828
U.S. President John Quincy Adams signs the Tariff of 1828 into law, protecting wool manufacturers in the United States.
27 Aug

Cisplatine War
Uruguay is formally proclaimed independent at preliminary peace talks brokered by the United Kingdom between Brazil and Argentina during the Cisplatine War.
5 Nov

Morea expedition
Greek War of Independence: The French Morea expedition to recapture Morea (now the Peloponnese) ends when the last Ottoman forces depart the peninsula.
16 Nov

London Protocol (1828)
Greek War of Independence: The London Protocol entails the creation of an autonomous Greek state under Ottoman suzerainty, encompassing the Morea and the Cyclades.