Aaron (French ship) [1 reference]

Abigail (U.S. schooner) [1 reference]

Aborn, Thomas [1 subentry]

Adams, John [2 subentries]

Adams, John (supercargo of Mary) [3 references + 1 subentry]

Adams, John Quincy [3 references]

Adams (U.S. frigate) [9 references + 2 subentries]

Adams County, Miss. Territory [2 references]

Addington [See redirect]

Adelaide (ship) [1 reference]

Adet, Pierre-Auguste [2 references]

Adra, Spain [1 reference]

Africa [1 reference]

Agriculture [3 references + 4 subentries]

Aix, Louis-Charles-Antoine des [2 references]

Albemarle County, Va. [1 reference]

Alexander I (of Russia) [5 references + 1 subentry]

Alexander, Lawson [1 subentry]

Alexander (U.S. brig) [1 reference]

Alexandria, Egypt [2 references]

Alexandria, Va. [4 references]

Alexandria Expositor (Va.) [1 reference]

Algeciras, Spain [1 reference]

Algiers [5 references + 22 subentries + 4 “see also” entries]

Alicante, Spain [5 references + 1 subentry + 1 “see also” entry]

Allegheny River [1 reference]

Allen, James [2 subentries]

Alligator (Spanish privateer) [1 reference]

Almeida de Mello e Castro, João de, conde das Galveas [12 references + 2 subentries]

Almería, Spain [1 reference]

Almgren, William [1 subentry]

Alnomac (Alromac) (U.S. ship) [1 reference]

Alsaga, Martin de [1 subentry]

Altamaha River [1 reference]

Altona, Germany [1 reference]

American Board of Agriculture [1 reference + 1 subentry]

American Mercury (Hartford, Conn.) [1 reference]

American Republican Gazette (Concord, N.H.) [1 reference]

American Revolution [11 references]

Amherst County, Va. [1 reference]

Amiens, France [2 references]

Amiens, Treaty of (1802) [19 references + 5 subentries]

Amite River [1 reference]

Amity (U.S. ship) [2 references]

Amity and Commerce, Treaty of (1799) (with Prussia) [1 subentry]

Amsterdam [2 references + 1 “see also” entry]

Anadia [See redirect]

Andalusia, Spain [1 subentry]

Anderson, James [2 subentries]

Andréossy, Antoine-François [3 subentries + 1 “see also” entry]

Andromache (British frigate) [2 references]

Anne (French ship) [4 references]

Antigua, West Indies [1 reference]

Antwerp, Belgium [7 references + 6 subentries + 1 “see also” entry]

Apalachee River [1 reference]

Apalachicola River [1 reference]

Appleton, Thomas [2 subentries]

Aragon, Spain [1 reference]

Arango y Parreño, Francisco [4 references]

Aranjuez, Spain [4 references]

Aranjuez, Treaty of (1801) [2 references]

Ardente (ship) [1 reference]

Argo (U.S. ship) [1 reference]

Argus (U.S. ship) [1 reference]

Arkansas River [7 references]

Armesto [See redirect]

Armfeldt, Baron [1 subentry]

Armstrong, John [2 references]

Arnold, Jonathan [1 reference]

Arrowsmith, Aaron [1 reference]

Arundel, Rebecca Crane (O'Brien's mother) [2 references]

Arvez, Morocco [1 reference]

Ashley, John [1 reference]

Asturias, prince of [See redirect]

Atkinson, Andrew [1 reference]

Attakapas, La. [1 reference]

Atwater, Reuben [1 reference]

Augsburg, Germany [1 reference]

Augusta(U.S. brigantine) [1 subentry]

Augustus Frederick, duke of Sussex [1 reference]

Auldjo, Thomas [1 subentry]

Aurora (U.S. ship) [6 references]

Aurora General Advertiser (Philadelphia) [3 references]

Austin, Jonathan Loring [2 subentries]

Austria [5 references + 1 subentry]

Avignon, France [1 reference]

Aymé, Jean-Jacques (Job) [2 subentries]

Azara, José Nicolás de, marquis de Nibbiano [1 subentry]

Azulai, Solomon [1 subentry]