Ultimaker printers are distributed in North America through a number of authorized resellers. These printers are assembled in the US, by fbrc8's dedicated production team. fbrc8 provides warranty support, as well as offering official Ultimaker spare parts and filament.
Ultimaker's warranty includes covering parts against defect/failing for one year (excluding the hot end and normal wear and tear on consumables), and assistance from fbrc8's tech support team for as long as you own your printer. For more information about Ultimaker's warranty policy, please see here.
You can find a list of authorized Ultimaker resellers in the US here.
If you're located in Canada check out the list of resellers in Canada here.