Image credits
Where the pictures in El Trivia’s quizzes come from. All of them are in the public domain in the United States; nothing here is a license to reuse anything else on the site.
Presidents’ portraits
Used in US Presidents by Picture, cropped and resized only. Each is an official or historical portrait whose public-domain status rests on one of three grounds: a work of the US federal government, a work published before 1931, or a faithful photograph of a public-domain painting.
| President | Author | Date | Public domain as | Source |
|---|---|---|---|---|
| George Washington | Gilbert Stuart | 1803 | reproduction of a public-domain painting | Source |
| John Adams | Gilbert Stuart | circa 1800 | reproduction of a public-domain painting | Source |
| Thomas Jefferson | Rembrandt Peale | 1800 | reproduction of a public-domain painting | Source |
| James Madison | John Vanderlyn | 1816 | reproduction of a public-domain painting | Source |
| James Monroe | Samuel Finley Breese Morse | circa 1819 | reproduction of a public-domain painting | Source |
| John Quincy Adams | Mathew Brady | circa 1843-1848 | published before 1931 | Source |
| Andrew Jackson | Ralph Eleaser Whiteside Earl | circa 1835 | reproduction of a public-domain painting | Source |
| Martin Van Buren | Mathew Benjamin Brady | between circa 1855 and circa 1858 | published before 1931 | Source |
| William Henry Harrison | Albert Gallatin Hoit | 1840 | reproduction of a public-domain painting | Source |
| John Tyler | George Peter Alexander Healy | 1842 | reproduction of a public-domain painting | Source |
| James K. Polk | Mathew Brady | 1849-02-14 | published before 1931 | Source |
| Zachary Taylor | Unknown (daguerreotype, Library of Congress) | between circa 1843 and circa 1845 | published before 1931 | Source |
| Millard Fillmore | Mathew Benjamin Brady | circa. 1855-1865 | published before 1931 | Source |
| Franklin Pierce | Mathew Brady (restored by Adam Cuerden) | between 1855 and 1865 | published before 1931 | Source |
| James Buchanan | From Brady daguerreotype (Mathew Brady) (1822-1896) | between 1850 and 1868 | published before 1931 | Source |
| Abraham Lincoln | Alexander Gardner | 8 November 1863 | published before 1931 | Source |
| Andrew Johnson | Mathew Benjamin Brady | before 1875 | published before 1931 | Source |
| Ulysses S. Grant | Brady-Handy studio | between 1870 and 1880 | published before 1931 | Source |
| Rutherford B. Hayes | Mathew Benjamin Brady | between circa 1870 and circa 1880 | published before 1931 | Source |
| James A. Garfield | Brady-Handy studio | 1881 | published before 1931 | Source |
| Chester A. Arthur | Abraham Bogardus (restored by Adam Cuerden) | 1880s | published before 1931 | Source |
| Grover Cleveland | Napoleon Sarony | 1892-08-09 | published before 1931 | Source |
| Benjamin Harrison | Pach Brothers (restored by Adam Cuerden) | 1896 | published before 1931 | Source |
| William McKinley | Unknown (Library of Congress) | circa 1900 | published before 1931 | Source |
| Theodore Roosevelt | Pach Brothers (restored by Adam Cuerden) | 1904 | published before 1931 | Source |
| William Howard Taft | Pach Brothers (restored by Adam Cuerden) | 1908 | published before 1931 | Source |
| Woodrow Wilson | Harris & Ewing, photographer | 1914 | published before 1931 | Source |
| Warren G. Harding | Harris & Ewing, photographer | circa 1920 | published before 1931 | Source |
| Calvin Coolidge | Harris & Ewing | circa 1924 | published before 1931 | Source |
| Herbert Hoover | Underwood & Underwood | 1928 | published before 1931 | Source |
| Franklin D. Roosevelt | Office of War Information (NARA 535943) | between 1942 and 1945 | US federal work | Source |
| Harry S. Truman | Frank Gatteri, United States Army Signal Corps | circa 1945 | US federal work | Source |
| Dwight D. Eisenhower | The White House | 1959-05-29 | US federal work | Source |
| John F. Kennedy | Cecil W. Stoughton | 1963-07-11 | US federal work | Source |
| Lyndon B. Johnson | Yoichi Okamoto | 9 January 1969 | US federal work | Source |
| Richard Nixon | White House photograph (NARA 530679) | 1 June 1972 | US federal work | Source |
| Gerald Ford | David Hume Kennerly | 27 August 1974 | US federal work | Source |
| Jimmy Carter | Department of Defense (NARA 558522) | 1978 | US federal work | Source |
| Ronald Reagan | Michael Evans | 7 February 1981 | US federal work | Source |
| George H. W. Bush | David Valdez | 15 February 1989 | US federal work | Source |
| Bill Clinton | Bob McNeely, The White House | 1993-01-01 | US federal work | Source |
| George W. Bush | Eric Draper | 14 January 2003 | US federal work | Source |
| Barack Obama | Pete Souza, The White House | 6 December 2012 | US federal work | Source |
| Donald Trump | Daniel Torok | 2025-06-02 | US federal work | Source |
| Joe Biden | Adam Schultz | 2021-03-03 | US federal work | Source |
Flags
Used in Flags of the World: the country-flags collection, drawn from Wikimedia Commons, which treats national flags as public domain; Kyrgyzstan’s from Wikimedia Commons.
Maps
The world map is drawn from Natural Earth and the US map from the US Census Bureau’s cartographic boundary files, both in the public domain.
Photos
The photographs on the posters are from Unsplash, credited at the foot of every page.