> [ . . . ] although the -um spelling was occasionally used in Britain, the American scientific language used -ium from the start. [ . . . ] In 1828, an American lexicographer, Noah Webster, entered only the aluminum spelling in his American Dictionary of the English Language. In the 1830s, the -um spelling gained usage in the United States; by the 1860s, it had become the more common spelling there outside science [ . . . ] By 1890, both spellings had been common in the United States, the -ium spelling being slightly more common; by 1895, the situation had reversed; by 1900, aluminum had become twice as common as aluminium; in the next decade, the -um spelling dominated American usage. In 1925, the American Chemical Society adopted this spelling.
en.wikipedia.org/wiki/Aluminiuβ¦
*shakes fist*
Websteeeeeer!