Posted by Angelina on Friday, May 6, 2011 at 12:51am.
1 and 3 are fine.
In order to use the plural possessive (Americans'), there must be a noun right after the possessive for it to own.
Here are some examples:
The boys' toys were all over the front yard.
We wanted to see my friends' new performance.
Rethink #2 and repost.
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