Answer: This answer is from the website online National Archives. Gov
Explanation: From this source it says "On June 16, 1866, the House Joint Resolution proposing the 14th Amendment to the Constitution was submitted to the states. On July 28, 1868, the 14th amendment was declared, in a certificate of the Secretary of State, ratified by the necessary 28 of the 37 States, and became part of the supreme law of the land"
Remember this is from a online/internet source
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