[AntiGuv]

"...when ratified by the legislatures of three fourths of the several states, or by conventions in three fourths thereof, as the one or the other mode of ratification may be proposed by the Congress..."

[aristeides]

I believe the one amendment that has been passed by state conventions was the 21st Amendment (repealing Prohibition). Conventions were chosen in that case, I believe I have read, because the amendment could thereby be ratified more quickly. And I think the 21st Amendment was in fact the amendment ratified most quickly, within a year.