Geography comes first. Close upon the confluence of the Allegheny and Monongahela rivers, one gets a sense of westward flowing waters, but a map of Western Pennsylvania shows the Allegheny flowing south and the Monongahela north, almost at right angles to the Ohio. [ngg src=”galleries” ids=”25″ display=”basic_thumbnail” thumbnail_crop=”0″] A fourth river, the Potomac, comes into …













