It's worth noting that half of American Hispanics identify as "white" to the census, since it asks for race and ethnicity seperately (i.e. you can be black and hispanic too) The census actually counts 90% of Hispanics as white, because their answers (mostly "other race") don't fit better in any other category.

Taking that into account, the USA is either 70% or 78% white. (And presumably that bumps Canada up to 78.7% or so too.)