美国 美国向西扩展  (1790年3月29日～1862年1月18日)

开端 终结 在位 1841年 1845年 

　　约翰·泰勒（1790年3月29日－1862年1月18日），美国第十任总统(1841年4月4日 – 1845年3月4日)，辉格党人，是第一个因在任总统逝世而以副总统继任为总统的人。因此，人们对首次对副总统继任之后的地位感到困惑。泰勒非常反感别人称呼他为“副总统”或者“代总统”，并退回了所有对他称呼非为“总统”信函。在他的坚持下，副总统得在继任总统之后取得和总统一样的地位。
　　
　　约翰·泰勒1841年就任副总统，一个月后继任总统，迅速巩固了手中的权力。在任期间，改组美国海军；建立美国气象局；结束了佛罗里达州的第二次塞诺米尔战争。1861年初，主持华盛顿和平会议以调解南北方分歧。南北战争爆发后，他加入美国南方邦联的议会，1862年逝世。
　　
　　1845年3月3日，就是泰勒卸任总统的前一天，美国国会按照两院各三分之二多数议员的决议，推翻了泰勒此前对一项立法的否决。这是美国国会历史上首次推翻总统否决。

　　John Tyler, Jr. (March 29, 1790 – January 18, 1862) was the tenth President of the United States (1841–1845) and the first ever to obtain that office via succession.
　　
　　A long-time Democratic-Republican, Tyler was nonetheless elected Vice President on the Whig ticket. Upon the death of President William Henry Harrison on April 4, 1841, only a month after his inauguration, the nation was briefly in a state of confusion regarding the process of succession. Ultimately the situation was settled with Tyler becoming President both in name and in fact. Tyler took the oath of office on April 6, 1841, setting a precedent that would govern future successions and eventually be codified in the Twenty-fifth Amendment. At 51 years old, he was the youngest U.S. president to take office to that point (whereas Harrison had been the oldest man to take office as president).
　　
　　Arguably the most famous and significant achievement of Tyler's administration was the annexation of the Republic of Texas in 1845. Tyler was the first president born after the adoption of the U.S. Constitution, the only president to have held the office of President pro tempore of the Senate, and the only former president elected to office in the government of the Confederacy during the Civil War (though he died before he assumed said office).