This pleasure is related to pride.

The object or cause of this pleasure is, by the supposition, related to self, or the object of pride.

By this double relation of impressions and ideas, a transition is made from the one impression to the other.
Men are also vain of the temperature of the climate, in which they were born; of the fertility of their native soil; of the goodness of the wines, fruits or victuals, produced by it; of the softness or force of their language; with other particulars of that kind.

These objects have plainly a reference to the pleasures of the senses, and are originally considered as agreeable to the feeling, taste or hearing.

How is it possible they coued ever become objects of pride, except by means of that transition above-explained?
There are some, that discover a vanity of an opposite kind, and affect to depreciate their own country, in comparison of those, to which they have travelled.