Claims & Evidence

10 selected claims, the strength of the evidence behind them, the full citations, and, where the record disagrees, what is debated. Citations link to the matching card in the Primary Source Explorer. This registry does not yet cover every claim on the site.

1. Morocco opened its ports to American vessels in 1777; the 1786 Treaty of Peace and Friendship formalized relations and remains the longest unbroken treaty in U.S. history.

   Strong evidencePrimary document

   Citations

   • Treaty with Morocco, June 28 & July 15, 1786. U.S. Department of State, Office of the Historian. Source card →
   What's debated: Whether the 1777 decree counts as formal 'recognition' of independence is debated. The decree opened ports; formal relations date to the 1786 treaty.

2. Founding-era lawmakers explicitly considered Muslims ('Mahometans') when framing religious liberty and the ban on religious tests for office.

   Strong evidencePrimary document

   Citations

   • Jefferson, Thomas. Autobiography (1821); Virginia Statute for Religious Freedom, enacted January 16, 1786. Source card →
   • Debate in North Carolina Ratifying Convention, 30 July 1788. Elliot's Debates 4:191–215, in The Founders' Constitution (Univ. of Chicago Press). Source card →
   • Washington, George. Letter to Tench Tilghman, March 24, 1784. Founders Online, National Archives. Source card →
   • Locke, John. A Letter Concerning Toleration. Trans. William Popple. London, 1689. Source card →
   • Spellberg, Denise A. Thomas Jefferson's Qur'an: Islam and the Founders. Alfred A. Knopf, 2013. Source card →
   What's debated: Inclusion in principle is well documented; how far individual framers expected Muslim citizens in practice is interpreted differently by historians.

3. Enslaved West African Muslims in America left writing in Arabic, including Omar ibn Said's 1831 autobiography and the Bilali Document.

   Strong evidencePrimary document

   Citations

   • Said, Omar ibn. Life of Omar ibn Said, Written by Himself. 1831. Library of Congress, Arabic Manuscript Collection. Source card →
   • Muhammad, Bilali. Bilali Document (Ben Ali Diary), c. 1829. Hargrett Rare Book & Manuscript Library, University of Georgia. Source card →
   • Bluett, Thomas. Some Memoirs of the Life of Job, the Son of Solomon, the High Priest of Boonda in Africa. London: Richard Ford, 1734. Source card →
   • Islamic Manuscripts from Mali (16th century onward). Mamma Haidara Commemorative Library and the Library of Cheick Zayni Baye, Timbuktu; digitized in cooperation with the Library of Congress from 2004. Source card →

4. A meaningful share of enslaved Africans brought to the Americas were Muslim.

   Debated / contestedScholarly work

   Citations

   • Diouf, Sylviane A. Servants of Allah: African Muslims Enslaved in the Americas. New York University Press, 1998 (15th anniversary ed. 2013). Source card →
   • Gomez, Michael A. Black Crescent: The Experience and Legacy of African Muslims in the Americas. Cambridge University Press, 2005. Source card →
   What's debated: Estimates vary widely depending on region of origin and method. Scholars give ranges, not a single figure, and this site does not pick one.

5. Yarrow Mamout, a Muslim freed in 1796, became a property owner and investor in Georgetown.

   Strong evidenceScholarly work

   Citations

   • Peale, Charles Willson. Portrait of Yarrow Mamout, 1819. Philadelphia Museum of Art; Peale Family Papers. Source card →

6. Nicholas Said, a West African-born Muslim, served in the 55th Massachusetts during the Civil War.

   Strong evidenceInstitutional source

   Citations

   • Massachusetts Adjutant General, muster rolls of the 55th Massachusetts Volunteer Infantry (Colored), 1863–1865; National Park Service. Source card →

7. Early American mosques include Ross, North Dakota (1929) and the Mother Mosque of America in Cedar Rapids, Iowa (1934).

   Strong evidenceInstitutional source

   Citations

   • Ross Mosque, Ross, North Dakota (1929). Community and state historical archives. Source card →
   • National Park Service, 'Iowa: The Mother Mosque of America'; Islamic Center of Cedar Rapids history. Source card →
   What's debated: 'First mosque' depends on definition (purpose-built, longest-standing, still in use). Each site's claim is stated with its definition.

8. Elkader, Iowa (founded 1846) is a rare U.S. city named for an Arab and Muslim figure, Emir Abdelkader.

   Strong evidenceInstitutional source

   Citations

   • Abdelkader Education Project, Elkader, Iowa; Little Village, 'Founders of Elkader named their town after an Algerian freedom fighter' (2023). Source card →

9. Keith Ellison, the first Muslim elected to Congress, took his ceremonial oath on Thomas Jefferson's Qur'an in 2007.

   Strong evidenceInstitutional source

   Citations

   • Library of Congress press release, January 2007. Source card →
   • The Koran, commonly called the Alcoran of Mohammed. Springfield, MA: Henry Brewer for Isaiah Thomas Jr., 1806. Columbia University Libraries, The Quran in East and West. Source card →

10. Estevanico, described by Cabeza de Vaca as a "negro alárabe" native of Azamor, Morocco, was one of four survivors of the Narváez expedition who crossed the Gulf Coast and Southwest between 1528 and 1536.

    Strong evidencePrimary document

    Citations

    • Álvar Núñez Cabeza de Vaca, La Relación (Zamora, 1542); English excerpt via The American Yawp. Source card →
    • National Park Service, Coronado National Memorial, 'Esteban de Dorantes.' Source card →
    • Texas State Historical Association, Handbook of Texas Online, 'Estevanico.' Source card →
    What is inference, not record: Cabeza de Vaca gives his origin as Azamor and calls him "alárabe" (Arabized or Arabic-speaking), and the Texas State Historical Association records that he was baptized a Christian in Spain before 1527. Neither states what religion he practiced earlier. That he was raised Muslim is a historical inference from his birthplace and language, not a recorded fact, so this site does not describe him as a Muslim explorer.
    Review and revision notes

    Sources and wording last checked 2026-10-03.