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Ironically the US has the oldest constitution of any sovereign state[0]. Beats Norway (the second oldest) by 26 years.

Depends what you're counting as a constitution. San Marino has the US beat for oldest written and still active constitutional documents by 190 years.

The UK has an uncodified constitution that predates the US by over 500 years, originally founded on the Magna Carta, signed in 1215.