| William McKinley Timeline: Presidential Timeline of Important Events |
 | 1897 | His inauguration as 25th President of the United States |
| 1897 | The Dingley Tariff Law, which raised custom duties by an average of 57% |
| 1897 | Grant's tomb monument was dedicated on April 27, 1897 |
| 1897 | The Radio: Nikola Tesla invented the induction coil or Tesla coil, a device essential to sending and receiving radio waves and applied for his first patents in radio work in the United States. |
| 1898 | The Spanish-American War: Spain declares war on the US on April 23, 1898. The Spanish-American War was caused by US intervention in the Cuban War of Independence. The war ended Spain's colonial empire in America |
| 1898 | April: The Volunteer Army Act, authorizing the organization of the First Volunteer Cavalry, or Rough Riders, under the command of Lt. Colonel Theodore Roosevelt |
| 1898 | October: The War Revenue Act generated $150 dollars from taxes on popular 'luxury' goods |
| 1898 | The Battle of Sugar Point involving the US army and Chippewa Indians in Minnesota |
| 1898 | Edwin Prescott patented the first roller coaster. |
| 1898 | The Erdman Act prohibited discrimination against railroad workers because of union membership and provided for mediation of railway labor disputes |
| 1898 | The Annexation of Hawaii was started by US planters staging an uprising to overthrow Queen. The Annexation of Hawaii was an Act of Congress to annex the Republic of Hawaii and create the Territory of Hawaii. It failed and Hawaii was annexed by means of joint resolution, called the Newlands Resolution |
| 1898 | The 1898 Treaty of Paris: The US and Spain sign the treaty on December 10, 1898 |
| 1899 | The Boxer Rebellion (1899-1901) was a ferocious anti-foreigner movement against Christian missionaries and colonizers that took place in China between 1899 and 1901. |
| 1899 | John Thurman patents the motor-driven vacuum cleaner |
| 1900 | The Gold Standard Act established gold as the only standard for redeeming paper money. It stopped silver being exchanged for gold in the U.S. monetary system. |
| 1900 | The Zeppelin airship was invented by Count Ferdinand von Zeppelin |
| 1900 | The Galveston hurricane: The Galveston hurricane was the deadliest in United States history. The hurricane occured on September 8, 1900, in the city of Galveston, Texas |
| 1900 | September: The President was shot twice and fatally wounded on September 6, 1901 at the Pan-American Exposition in Buffalo, New York. His wounds became gangrenous and he died on September 14, 1901, aged 58. He was murdered by Leon Czolgosz. |
| 1901 | His presidency and term in office ended with his assassination. Leon Czolgosz was later put to death in the electric chair. The next US President was Theodore Roosevelt |
| William McKinley Timeline of important Events |
