<Li> February 23, 1861: The Baltimore Plot was an alleged conspiracy to assassinate President - elect Abraham Lincoln en route to his inauguration . Allan Pinkerton's National Detective Agency played a key role in protecting the president - elect by managing Lincoln's security throughout the journey . Though scholars debate whether the threat was real, Lincoln and his advisers took actions to ensure his safe passage through Baltimore . </Li> <Li> August 1864: A lone rifle shot fired by an unknown sniper missed Lincoln's head by inches (passing through his hat) as he rode in the late evening, unguarded, north from the White House three miles to the Soldiers' Home (his regular retreat where he would work and sleep before returning to the White House the following morning). Near 11: 00 pm, Private John W. Nichols of the Pennsylvania 150th Volunteers, the sentry on duty at the gated entrance to the Soldiers' Home grounds, heard the rifle shot and moments later saw the president riding toward him "bareheaded". Lincoln described the matter to Ward Lamon, his old friend and loyal bodyguard . </Li> <Ul> <Li> In 1909, Taft and Porfirio Díaz planned a summit in El Paso, Texas, and Ciudad Juárez, Mexico, a historic first meeting between a U.S. president and a Mexican president and also the first time an American president would cross the border into Mexico . Diaz requested the meeting to show U.S. support for his planned eighth run as president, and Taft agreed to support Diaz in order to protect the several billion dollars of American capital then invested in Mexico . Both sides agreed that the disputed Chamizal strip connecting El Paso to Ciudad Juárez would be considered neutral territory with no flags present during the summit, but the meeting focused attention on this territory and resulted in assassination threats and other serious security concerns . The Texas Rangers, 4,000 U.S. and Mexican troops, U.S. Secret Service agents, FBI agents and U.S. Marshals were all called in to provide security . An additional 250 private security detail led by Frederick Russell Burnham, the celebrated scout, was hired by John Hays Hammond . Hammond was a close friend of Taft from Yale and a former candidate for U.S. Vice-President in 1908 who, along with his business partner Burnham, held considerable mining interests in Mexico . On October 16, the day of the summit, Burnham and Private C.R. Moore, a Texas Ranger, discovered a man holding a concealed palm pistol standing at the El Paso Chamber of Commerce building along the procession route . Burnham and Moore captured and disarmed the would - be assassin within only a few feet of Taft and Díaz . </Li> </Ul> <Li> In 1909, Taft and Porfirio Díaz planned a summit in El Paso, Texas, and Ciudad Juárez, Mexico, a historic first meeting between a U.S. president and a Mexican president and also the first time an American president would cross the border into Mexico . Diaz requested the meeting to show U.S. support for his planned eighth run as president, and Taft agreed to support Diaz in order to protect the several billion dollars of American capital then invested in Mexico . Both sides agreed that the disputed Chamizal strip connecting El Paso to Ciudad Juárez would be considered neutral territory with no flags present during the summit, but the meeting focused attention on this territory and resulted in assassination threats and other serious security concerns . The Texas Rangers, 4,000 U.S. and Mexican troops, U.S. Secret Service agents, FBI agents and U.S. Marshals were all called in to provide security . An additional 250 private security detail led by Frederick Russell Burnham, the celebrated scout, was hired by John Hays Hammond . Hammond was a close friend of Taft from Yale and a former candidate for U.S. Vice-President in 1908 who, along with his business partner Burnham, held considerable mining interests in Mexico . On October 16, the day of the summit, Burnham and Private C.R. Moore, a Texas Ranger, discovered a man holding a concealed palm pistol standing at the El Paso Chamber of Commerce building along the procession route . Burnham and Moore captured and disarmed the would - be assassin within only a few feet of Taft and Díaz . </Li>

Who were the 3 presidents that got assassinated