William McKinley<!-- MOS:JR advises adding "Jr." only if sources generally refer to the person that way --> (January 29, 1843September 14, 1901) was the 25th president of the United States, serving from 1897 until his assassination in 1901. A member of the Republican Party, he led a realignment that made Republicans largely dominant in the industrial states and nationwide for decades. McKinley successfully led the U.S. in the Spanish–American War and oversaw a period of American expansionism, with the annexations of Hawaii, Puerto Rico, Guam, the Philippines, and American Samoa. Wikipedia
Who is popular today?