Is the United States a corporation or sovereign state?

Is The United States of America (commonly called the United States, the U.S., the USA, America, and the States), the federal constitutional republic comprising fifty states and a federal district a member of the class corporation, a formal business association with a publicly registered charter recognizing it as a separate legal entity having its own privileges, and liabilities distinct from those of its members or the class sovereign state (a state which is not under the control of any higher level state regardless of the level of international recognition)?

Facts Show facts

Show reasoning Reasoning

I followed this chain of reasoning:

By calculation (generator: ["in_group@trueknowledge.com"]) I know that:
corporation is in the group corporation and sovereign state

sovereign state is in the group corporation and sovereign state

By calculation (generator: ["now@trueknowledge.com"]) I know that:
The current time is May 18th 2013, 06:30:33

I know from locally stored knowledge that:
Fact 1: the United States is a sovereign state ([fact: ["361297535@trueknowledge.com"]])

Fact 1 is true for January 1st 2009 onwards ([fact: ["366831055@trueknowledge.com"]])

By calculation (generator: ["timeperiodtopoint@trueknowledge.com"]) I know that:
Fact 1 is true at May 18th 2013, 06:30:33

I used the following facts to provide this answer:

the United States has been a sovereign state since at least January 1st 2009

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