What happens if I try to re-enter the US and haven't filed my taxes?

in 2011, I lived in the US under nafta TN visa and worked legally in california for a year.
i left the country in early 2012 and never came back.
my employer never sent me my tax form and therefore I never filed taxes. I can't remember if my taxes were automatically withheld.

now I am about to go pass 2 weeks in the US as a tourist. what will happen when I arrive at the border?
Asked Jan 30, 2014

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