Metre

== Early adoptions of the metre internationally ==
{{Main|Metrication}}
In France, the metre was adopted as an exclusive measure in 1801 under the [[French Consulate|Consulate]]. This continued under the [[First French Empire]] until 1812, when [[Napoleon]] decreed the introduction of the non-decimal ''[[mesures usuelles]]'', which remained in use in France up to 1840 in the reign of [[Louis Philippe I|Louis Philippe]].<ref name="Larousse" /> Meanwhile, the metre was adopted by the Republic of Geneva.<ref>{{cite web |title=Metrisches System |url=https://hls-dhs-dss.ch/articles/013754/2014-05-22/ |access-date=2021-12-15 |website=hls-dhs-dss.ch |language=de }}</ref> After the joining of the [[canton of Geneva]] to [[Switzerland]] in 1815, [[Guillaume Henri Dufour]] published the first official Swiss map, for which the metre was adopted as the unit of length.<ref>{{cite web |title=Kartografie |url=https://hls-dhs-dss.ch/articles/008258/2014-11-26/ |access-date=2021-12-13 |website=hls-dhs-dss.ch |language=de }}</ref><ref>{{Cite journal|last=Dufour|first=G.-H.|date=1861|title=Notice sur la carte de la Suisse dressée par l'État Major Fédéral|url=https://www.persee.fr/doc/globe_0398-3412_1861_num_2_1_7582|journal=Le Globe. Revue genevoise de géographie|volume=2|issue=1|pages=5–22|doi=10.3406/globe.1861.7582}}</ref>

=== Adoption dates by country ===
* [[France]]: 1801–1812, then 1840<ref name="Larousse" />
* [[Canton of Geneva|Republic of Geneva]], Switzerland: 1813<ref name="Dubler-2014">{{cite web |title=Metrisches System |url=https://hls-dhs-dss.ch/de/articles/013754/2014-05-22/ |access-date=2021-12-09 |website=hls-dhs-dss.ch |language=de }}</ref>
* [[Kingdom of the Netherlands]]: 1820
* Kingdom of [[Belgium]]: 1830
* [[Chile]]: 1848
* [[Kingdom of Sardinia (1720–1861)|Kingdom of Sardinia]], Italy: 1850
* [[Spain]]: 1852
* [[Portugal]]: 1852
* [[Colombia]]: 1853
* [[Ecuador]]: 1856
* [[Mexico]]: 1857
* [[Brazil]]: 1862
* [[Argentina]]: 1863
* [[Italy]]: 1863
* [[United States]]: 1866<ref name=":5" />
* [[German Empire]], [[Germany]]: 1872
* [[Austria]], 1875
* [[Switzerland]]: 1877<ref name="Dubler-2014" />