Pacific Ocean [1 reference]

Paine, Thomas [1 reference + 1 subentry]

Palermo, Sicily [1 reference]

Palmer, Aaron H. [1 subentry + 1 “see also” entry]

Palmer, Amos [1 reference]

Palmer, George [2 references]

Panama, Isthmus of [1 reference]

Panama City, New Granada (now Panama) [1 reference]

Paradise Lost [3 references]

Pardons [1 reference + 1 subentry]

Paris, France [6 references + 3 subentries]

Paris, Treaty of (1763) [1 reference]

Paris, Treaty of (1783) [1 reference]

Parker, Daniel [1 reference]

Parker, Fielder [1 reference]

Parker, Isaac [1 reference]

Parker, Thomas [1 reference + 1 subentry]

Parsons, Theophilus [2 references]

Passamaquoddy, Mass. (now Maine) [1 reference]

Passyunk Township, Pa. [1 reference]

Patents [2 references]

Patterson, Robert [1 reference + 1 subentry + 1 “see also” entry]

Paul, Saint (the apostle) [1 reference]

Paulding, James Kirke [1 reference]

Paulding, William [1 reference]

Paul Hamilton (U.S. brig) [2 references]

Payne, Asa [1 reference]

Payne, D. V. [1 reference]

Payne, Henry [1 reference]

Payne, John [3 references + 1 subentry]

Payne, John C. [1 reference]

Peace Establishment Act (1801) [1 reference]

Pearce, Dutee J. [1 subentry]

Pearre, George [1 reference]

Peck, Abijah [1 subentry]

“Pelham” essays [2 references]

Peloponnesian War (431–404 B.C.) [2 references]

Pendleton, Edmund [1 reference]

Peninsular war [See redirect]

Pennsylvania [7 references + 13 subentries]

Pennsylvania, University of [2 references]

Pennsylvania Gazette (Philadelphia) [1 reference]

Pennsylvania Hospital [2 references]

Penn Township, Pa. [1 reference]

Pensacola, W.Fla. [11 references]

Peny, James [1 reference]

Peoria, Ill. Territory [5 references]

Peoria Lake [2 references]

Perceval, Spencer [6 references]

Perdido River [2 references]

Perkins, Simon [2 references]

Perpetual motion [1 reference]

Perry, Christopher Raymond [2 references + 1 subentry]

Perry, Oliver Hazard [2 references]

Persia (now Iran) [1 reference]

Peter Hoffman & Son (firm) [1 reference]

Peter the Great [1 reference]

Peters, John Thompson [2 references]

Peters, Richard [1 reference + 1 “see also” entry]

Peters, S. [1 reference]

Petersburg, Va. [2 references]

Petry, Jean-Baptiste [1 reference]

Pezuela, Ignacio de [1 reference]

Philadelphia, Pa. [19 references + 17 subentries]

Philadelphia College [1 reference]

Philips, John [1 reference]

Physicians [4 references + 1 “see also” entry]

Physick, Philip S. [1 subentry]

Piatt, John H. [1 reference]

Piatt, William [2 references]

Pickering, Timothy [3 references]

Picornell y Gomila, Juan Bautista Mariano [1 reference + 1 subentry]

Pierce, John [2 references]

Pigeon Roost (Ind. Territory) [2 references]

Pike, Zebulon, Sr. [1 reference]

Pike, Zebulon Montgomery [7 references + 3 subentries]

Pinckney, Charles [1 reference + 1 subentry]

Pinckney, Charles Cotesworth [2 references]

Pinckney, Henry Laurens [1 reference + 1 subentry]

Pinckney, Thomas [4 references + 4 subentries]

Pinkney, William (father) [6 references + 1 subentry]

Pinkney, William (son) [1 reference]

Piqua, Ohio [4 references]

Pitman, John [1 reference + 1 “see also” entry]

Pitman, Thomas G. [2 references]

Pitt, William, the elder [See redirect]

Pittsburgh, Pa. [16 references]

Pittsburgh Blues [2 references]

Pittsfield, Mass. [2 references]

Pittsford, Vt. [2 references]

Pittsylvania County, Va. [1 subentry]

Pizarro, José [1 subentry]

Pizarro (U.S. ship) [1 reference]

Plains of Abraham, Lower Canada [2 references]

Plattsburgh, Battle of (1814) [1 reference]

Plattsburgh, N.Y. [8 references]

Pleasants, Charles [1 reference]

Pleasonton, Stephen [1 subentry]

Ploughboy (U.S. ship) [2 references]

Plumer, William [2 subentries + 1 “see also” entry]

Plymouth, England [1 reference]

Plymouth, Mass. [3 references + 2 subentries]

Pogue, Robert [2 references]

Poictiers (British ship) [2 references]

Poindexter, George [1 reference + 1 “see also” entry]

Pointe Coupee, La. [4 references]

Pointe de Levy, Lower Canada [2 references]

Point Judith, R.I. [1 reference]

Point Petre, Ga. [1 reference]

Point Pleasant, Va. (now W.Va.) [2 references]

Poland [2 references]

Pollock, John [1 reference]

Polly (U.S. ship) [1 reference]

Pond, Benjamin [2 references + 1 “see also” entry]

Pontoire, M. [1 subentry]

Pontoons [1 reference]

Pope, Alexander [3 references]

Pope, Nathaniel [1 reference]

Pope, William [1 reference + 1 subentry]

Popham, Home Riggs [1 reference]

Porgia (British brig) [1 reference]

Porter, Augustus [2 references]

Porter, David, Jr. [1 subentry + 1 “see also” entry]

Porter, Moses [3 references]

Porter, Oliver [1 reference]

Porter, Peter B. [2 references]

Porterfield, Robert [2 references + 1 subentry]

Portland, Mass. (now Maine) [2 references + 1 subentry]

Portobelo, New Granada (now Panama) [1 reference]

Porto Cavello [See redirect]

Port Royal, S.C. [1 reference]

Portsmouth, England [1 reference]

Portsmouth, N.H. [3 references]

Portugal [3 references + 1 subentry]

Posey, Lloyd [1 reference]

Posey, Thomas [2 references + 1 “see also” entry]

Post Office [3 subentries]

Potawatomi Indians [3 references]

Potomac River [6 references]

Potter, Elisha R. [1 reference + 1 subentry]

Potter, S. [1 subentry]

Poutingon, J. A. P. [1 reference + 1 subentry]

Powhatan County, Va. [3 references]

Prairie du Chien, Ill. Territory [2 references]

Preble, Edward [2 references + 1 subentry]

Presbyterian Church [1 reference]

President (U.S. frigate) [3 references]

President's House [2 references]

Press [5 subentries + 1 “see also” entry]

Prevost, George [5 references + 3 subentries + 1 “see also” entry]

Prince Georges County, Md. [2 references]

Prince regent (of Great Britain) [See redirect]

Princeton University [See redirect]

Prisoners of war [2 references + 5 subentries]

Privateers [9 references]

Procter, Henry [2 references]

Prophet [See redirect]

Prophetstown, Ind. Territory [3 references]

Providence, R.I. [6 references]

Providence County, R.I. [2 references]

Providence Gazette [2 references]

Providence Patriot [See redirect]

Prussia [2 references]

Pseudonyms [11 references]

Pueblo, Colo. [1 reference]

Puerto Cabello, Venezuela [2 references]

Pulaski, Kazimierz [1 reference]

Pulaski, Tenn. [1 reference]

Puryear, Peter [1 reference]