Between 1820 and 1870, HBC issued its own paper money.

Between 1795 and 1820, she was Princess of Wales.

Between 1800 and 1820, the legendary Colonel Plug also, known as Col. Plug or Colonel Fluger, ran a gang of river pirates on the Ohio River, in a cypress swamp, near the mouth of the Cache River, which was below Cave-In-Rock and Fort Massac and just above the confluence of the Ohio and Mississippi Rivers.

Between 1812 and 1816 divisions developed between an Unitarist faction centred on Buenos Aires and a Federalist faction in the provinces, which eventually led to a series of civil wars that ended with the conquest of Buenos Aires by Federalist caudillos at the Battle of Cepeda in 1820.

Between 1780 and 1820, the first settlers were joined by others coming from the Attakapas Territory, from the Pointe Coupée Territory, and east from the Atchafalaya River area.

Between 1820 and 1823 he prepared a treatise on a complete system of non-Euclidean geometry.

* Between a Rock and a Hard Place: A History of American Sweatshops, 1820 – present An online exhibition from the National Museum of American History, Smithsonian Institution

Between 1810 and 1820, several French Canadian fur traders, including Lamar Andie, Jean Baptiste Recollect, and Pierre Constant had established fur trading posts around Muskegon Lake.

Between 1820 and 1829 there were two fulling mills and one carding mill in operation, and sheep raising peaked circa 1830.

Between 1820 and 1823, the people of Kraków erected the Kościuszko Mound to commemorate the Polish leader.

The first industry was a flour mill built by James McCormick in 1817. Between 1820 and 1850 there were two more flour mills, a carding mill, two saw mills, two barrel factories, two distilleries, a wheelwright, a millwright, blacksmith and a tannery.

Between 1820 and 1850, the non-mechanized factories supplanted the traditional artisan shops as the predominant form of manufacturing institution.

Between 1810 and 1820, local farmers, who believed that wolves were denning in the blowdowns, set fire to the mountain again.

Between 1820 and 1831 the British had constructed a similar albeit larger citadel in Quebec City known as the Citadel of Quebec.

Between 1820 and 1835 alone, some 5000 Mexicans died in Apache raids, and 100 settlements were destroyed.

Between 1820 and 1830, the Iowa ceded their Minnesota, Iowa and Missouri lands to the U. S. government.

Between 1820 and 1830, according to a statement made by Lundy himself, he traveled “ more than 5000 miles on foot and 20, 000 in other ways, visited 19 states of the Union, and held more than 200 public meetings .” He was bitterly denounced by slaveholders and also by such non-slaveholders as disapproved of all anti-slavery agitation, and in January 1827 he was assaulted and seriously injured by a slave-trader, Austin Woolfolk, whom he had severely criticized in his paper.

Between the years of 1794 and 1833, the Penobscots and Passamaquoddy tribes ceded the majority of their lands to Massachusetts ( then to Maine after it became a state in 1820 ) through treaties that had not been approved by the Federal government.

Between 1817 and 1820 it was treason to kill the Prince Regent.

Between 1820 and 1846, the Russian Empire allocated land to the Gagauz and gave them financial incentives to settle in Bessarabia in the settlements vacated by the Nogai tribes.

Between 1820 and 1860, the port of St. Andrews was used extensively during the Irish Migration.

Between 1820 and 1910, Hungarian speaking population in Bačka increased from 121, 688 ( 31. 5 %) to 363, 518 ( 44. 75 %).

Between 1820 and 1924, the university experienced numerous changes, including temporary closings, fractures, refinancing and changes of denomination, caused on more than one occasion by political reasons.

Between 1740 and 1820, the Leeds-Elland and Dewsbury-Leeds turnpike roads were built through Beeston ; nationalised in the 1870s these roads remain through the area as Elland Road and Dewsbury Road respectively.

Between 1822 and 1824, she served in the West Africa Squadron ( or ' Preventative Squadron ') chasing down slave ships, capturing at least two.

Between 1821 and 1824, first and second national assemblies were held, and the constitutions of 1822 and of 1823 were established.

Between 1823 and 1824, some of the free states created their own constitutions and others had already installed a Constituent Congress.

Between 1824 and 1826 he lived and worked in Scarborough, and was responsible for the building of the Rotunda, a geological museum devoted to the Yorkshire coast. The Rotunda was re-opened as ' Rotunda – The William Smith Museum of Geology ', on 9 May 2008 by Lord Oxburgh, however, the Prince of Wales visited the Rotunda as early as 14 September 2007 to view the progress of the refurbishment of this listed building.

Between 1824 and 1825 it was rebuilt with brick due to a petition to build all buildings on the Public Square in brick to prevent the spread of fire.

Between 1794 and 1824 Soane remodelled and extended the house into two neighbouring properties — partly to experiment with architectural ideas, and partly to house his growing collection of antiquities and architectural salvage.

Between 1810 and 1824 he persistently controverted the reality of Ireland's Astronomer Royal John Brinkley's imaginary star-parallaxes.

Between the 1823 and 1824 editions Müller varied the texts slightly, but also ( with the addition of the further 12 poems ) altered the order in which they were presented.

Between 1824 and 1862 she produced about 70 works, the most successful of which were novels of fashionable English life.

Between 1804 and 1824 the Thames and Medway canal was dug.

Between 1817 and 1824, he started a traditional primary school at La Valla and used it as a teacher training centre for his young Brothers.

Between 1816 and 1824 he was de facto the minister of industry of the Congress Poland ( styled officially the " director of the Department of Trade, Crafts and Industry ") and initiated construction of the Old Polish Industrial Area ( Staropolski Okręg Przemysłowy ).

Between 1824 and 1851, at least 16 sizeable vessels were wrecked in the vicinity of Pedra Branca and Point Romania ( on the Johor coast ).< ref >;

Between 1824 and 1830 Ogden set out on a series of expeditions to explore the Snake River country.

Between 1824 and 2006, they answered 36358 distress calls and saved 79887 people out of distress situations.

Between 1819 and 1824, Turner returned to sea in the schooner Nonsuch attached to a squadron commanded again by Oliver Hazard Perry.

Between these duties he served a number of years as the Mayor of New Brunswick, New Jersey including 1792 – 1794, 1801 – 1813, and 1821 – 1824.

Between 1799 and 1824 he published a significant number of collections of tunes.

Between 1824 and 1826, Grainger built most of Eldon Square and Blackett Street.

Between 1822 to 1824, Almonte was on the staff of insurgent rebel leader José Félix Trespalacios in Texas and then was sent as a part of the Mexican delegation to London.

Between February 1819 and February 1824, Darling commanded the British troops on Mauritius, before serving as acting Governor of the colony for the last three years of his stay, exhibiting administrative ability.

Between 1772 and 1824, Demyansk was a part of Starorussky Uyezd of Novgorod Viceroyalty ( since 1796 of Novgorod Governorate ).