I will look at two lines from this poem. In both of these lines, Birney is arguing that Canada is not really a very "cultured" country.
The first of these is Line 9, where Birney says that Canada is a youth that only likes books about bears. This is saying that Canada, as a country, is not highbrow. It is not a country of people interested in literature and the arts. Canada, he says, is more interested in the outdoors, in physical things, not in the arts.
A similar point is being made in Lines 14 and 15. There, Birney compares Canada to France. He says that Canada is not as "witty" as France. This means that Canada is not an intellectual and artistic country.
Canada and the US have both been seen, at times, as being more rustic, lowbrow and colonial -- not refined and continental. This is what Birney is saying in the lines I have chosen.