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In page Timeline of African-American history:

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1820

  • March 6 – The Missouri Compromise allows for the entry as states of Maine (free) and Missouri (slave); no more slave states are allowed north of 36°30′.[citation needed]
  • The British West Africa Squadron's slave trade suppression activities are assisted by forces from the United States Navy, starting in 1820 with the USS Cyane. With the Webster–Ashburton Treaty of 1842, the relationship is formalised and they jointly run the Africa Squadron.[citation needed]