Ahh, no wonder I never heard of this...

From Wikipedia:

The United States government played an active role in the drafting of the convention and signed it on 16 February 1995, but has not ratified it. It has been claimed that American opposition to the convention stems primarily from political and religious conservatives.

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Most notably, at the time several states permitted the execution and life imprisonment of juvenile offenders, a direct contravention of Article 37 of the convention.

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During his 2008 campaign for President, Senator Barack Obama described the failure to ratify the convention as "embarrassing" and promised to review the issue but, as President, he never did. No President of the United States has submitted the treaty to the United States Senate requesting its advice and consent to ratification since the US signed it in 1995.

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This would make me feel very alone as a child to know this... 😢

Edit: Been reading more and kinda sad child marriage isn't part of it. Also corporal punishment should go away too.