What kinds of conventions are described in Article V?
There are two kinds of conventions discussed in Article V:
The first is the convention for proposing amendments. There are two schools of thought regarding this sort of convention. Some scholars maintain that this convention may be limited in terms of the kinds of amendments that are on the table through language employed in the legislation used to call the convention. Others argue that the only kind of convention Congress is authorized to call under Article V is a general convention, one at which any amendment may be proposed.
The second is the state ratifying convention, whether the amendment is proposed by Congress or by the states. Congress may decide whether amendments will be ratified by the state legislatures or state conventions. The only amendment that ratified by state conventions instead of state legislatures was the 21st Amendment repealing Prohibition.