Filter state boundaries (admin_level 4) by area?

[hughkelley]

As a note, this query above includes two canadian provinces in addition to the US states and territories. Asked for a solution in this thread:

US States Boundaries Only, despite Overlap with Canadian provinces

I have this query below that grabs admin level 4 boundaries within the US, but it seems that British Columbia and the Yukon Territories overlap slightly with the US border somewhere so those are getting selected too. Thanks for any suggestions. [out:json]; area ['admin_level'='2'] ['name'='United States']; (relation['admin_level'='4'](area);); out geom;