Most of America's pasture and grazing land is too rich and flat for it to make sense to raise sheep, when cows are the alternative. You see sheep and goats in

Most of America's pasture and grazing land is too rich and flat for it to make sense to raise sheep, when cows are the alternative. You see sheep and goats in hilly, rugged areas of the US, but those are few and far between (and not generally economically viable).