On Tuesday, February 24, 2015 at 4:23:54 PM UTC-5, JJ Sinclair wrote:
Get Transport Canada to "De-register the sailplane for export to USA", then obtain an "N" number and fill out a request for registration, send it to the FAA along with the bill of sale you got from the seller and your check for $5 bucks and the paperwork should be all done. Have an A&P / AI inspect the machine and sign off an annual and then you get to fly your new honey..
JJ
Plus, scrub off the "C" number and put on your new "N" number. Acetone usually removes old numbers and the new one can be vinyl.

Not as simple as JJ says. I imported a glider from Canada with a standard certificate of airworthiness with excellent documentation.

Someone in the US has to issue a US certificate of airworthiness and while having an export certificate of airworthiness available helps it does not make the process pain free, read $$$. I obtained export C of A from Canada. You might get lucky. Then the trailer is yet another story, careful here.