That's an interesting question. I bought a 2007 Ford Explorer through Kaisen (Eric) at a wholesale auction that supposedly had originally been sold in Canada. In the northern part of the state it's not uncommon for Canadians to come over the border to shop, especially when the exchange rate is favorable so I don't know whether the car was originally sold in the US and brought to Canada and made its way back or if it was sold in Canada originally. Eric said it didn't matter and didn't think anything of it. We're well out of warranty but we've had it serviced at the dealer and no one has ever batted an eye. The only consequence I know of is that the owner's manual is in French. No kidding. I think it makes the truck seem a little more classy.
Anyway, here's the 2014 Jeep Warranty for the US
http://www.jeep.com/crossbrand/warranty/pdf/2014_Jeep_Warranty.pdf
The Basic Limited Warranty covers your vehicle only if:
• it was built for sale in the U.S.;
• it’s registered in the U.S.;
• it’s driven mainly in the U.S. or Canada;
Here is the 2014 Jeep Warranty in Canada
http://www.chryslercanada.ca/owners/en/manuals/2014/2014B-Grand_Cherokee-WML-1st.pdf
VEHICLES COVERED
The warranties in this booklet cover new vehicles only which are built for sale in Canada and are registered and normally operated in Canada. The warranties apply to all owners of the vehicle.
The thing is that Jeeps are probably manufactured "for" the US market and the Canadian market at the same time. If so, it seems that a vehicle built for either the US or Canadian market but sold in Canada would be covered in the US if it was resold to an American and registered in the US.
That's the argument I would make.