What are important events during presidency of john tyler?

During John Tyler's presidency (1841-1845), significant events included the annexation of Texas, which became a contentious issue leading to future conflicts. Tyler also faced challenges from his own party, the Whigs, who expelled him for vetoing key legislation. Additionally, he oversaw the establishment of a new postal system and the resolution of the boundary dispute with Britain over the Oregon territory. His presidency was marked by political instability and conflict with Congress.