Further to the input from others here I would encourage you to look at the Bilateral Aviation Safety Agreement, in force between the United States and Canada, on flight crew licensing. Once you hold a Transport Canada CPL, with whichever ratings are appropriate to the work you intend to perform, it can be converted to an FAA equivalent fairly painlessly. The conversion process is outlined in TC AC No. 401-001
here.
Secondly, should you choose to acquire an EASA-FCL CPL the route to obtaining a TC equivalent will be extremely straight-forward. The details for that process can be found
here. Aside from those two routes there will be, in time, a bilateral agreement between EASA and Transport Canada similar to the one mentioned above.
For others interested in doing something similar - Canada operates a Youth Mobility scheme with a number of European states providing a work opportunity for 12 to 24 months. The relevant information for British citizens can be found
here.