Zydor -
Its should be it's.
'It is', shortened to a single word is - it's.
Just another 'grammar nanny' coming to the rescue.
Its indicates a plural of something - as in, more than one of.
Incorrect usaage, in this case.
(and american should really be capitalized - American)
I like my smug grammar nannies to also spell things correctly.
Usaage should be usage. Just coming to your rescue.
Grammar nannies should also try not to end a statement or sentence in a preposition...bad form chap