All of them were, or they wouldn't be amendments. There may be one or two with unclear histories.
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Eighteen Amendment
Ratified
It was ratified in 1781.
15th amendement
2/3 of both houses The above is incorrect. For an amendment to become part of the Constitution it must be ratified by 3/4th's of the States. With 50 states, this means 38 states must ratify and accept the amendment--this can take years and some amendments have never been ratified. It does take 2/3rd's of both houses of Congress to pass an amendment before it goes to the states to be ratified.