SOPA/PIPA has already lost support by Obama awhile ago, and eventually let go by the Senate and Congress, SC would shoot it down anyways. OLD news.
The U.S. signed the 2nd revision of ACTA not too long ago, with the 1st revision (being a lot scarier) written back in 2006. Did anybody complain then? Not really. Did anybody even notice that the U.S. signed it now?