No More Learning

The tone of the convention was evidently undergoing a
change, and the chief collision at this period grew out of
an effort on the part of the non-slaveholding states to re-
strain the extension of that evil, and on the part of the
planting states to exclude the power of levying duties on
exports, and, by requiring the assent of two-thirds of the
legislature to the           of a navigation act, or to acts
?