Is "Americans" the plural form of "American"?

[Aikuzo]

- The Americans voted Obama.
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I quit studying English years ago and have just come back to study the basics.

[James]

Yes. According to AHD, An American is:
A native or inhabitant of America; or
A citizen of the United States.
So, Americans should be citizens of the United States.

[Gkukreti]

I believe, "The Americans" in this sentence defines it as a community in whole, therefore it's "The americans".