Yes Americans actually say the word Aluminium as Aluminum too. I guess it's right for them, but is of course wrong for English.
Well the history is this:
"Discovered: H.C. Oersted in 1825
Name: From alum, used by ancient Greeks and Romans as an astringent and as a mordant in
dyeing. Sir Humphrey Davy proposed the name aluminum, but changed it to aluminium
to have it conform to the spelling of other metals. This spelling was used in the U.S.
until 1925 when the ACS when back to the original spelling. The rest of the world uses
the “-ium” ending."
Wikipedia says the facts are different to that though with much more detail so i don't what is right now. And i wont bother pasting all that in.
The internet is full of rubbish. I just checked a random science information site and look what it says. Spot the stupid mistakes from
www.facts-about.org.uk/
"
Brief Facts about the Discovery and History of the Element Aluminum
Aluminum was discovered by Hans Christian Oersted in 1825. Isolated by Friedrich Wohler in 1827. Charles Martin Hall received a patent in 1886. Davy had proposed the name Aluminium for this metal in 1807 before it had been Isolated, but later agreed to change it to Aluminum to conform with the "ium" ending of most other named elements. Aluminium remained an acceptable alternative spelling to Aluminum until 1925 when the American Chemical Society chose to spell the metal's name Alumunum in all their new publications."