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When Vice-President succeeded William Henry Harrison to the presidency, he immediately found himself at odds with the leadership of the congressional Whigs.
Rebel armies claimed the independence of the Republic of after defeating Mexican forces at the Battle of San Jacinto in April 1836.
Their poignant letters and journals reveal that the westward movement was particularly hard for .
Oregon and were the most alluring destinations of American pioneers in the 1840s.
The Oregon Trail began at the western border of Missouri, crossed the Continental Divide at South Pass, then followed the Columbia River to the entrance of the Valley.
, who tried to ignore the Texas annexation issue, lost the Democratic party's presidential nomination to James K. Polk in 1844.
Diplomatic negotiations led to an agreement between the United States and Britain to establish the boundary between Oregon country and Canada along the th parallel.
Before the war with Mexico, President Polk sent to Mexico City with an offer to purchase California.
Throughout the Mexican War, some members of Congress like Illinois Congressman , accused President Polk of waging an unjust war of aggression.
During the Mexican War, General Winfield Scott's forces successfully captured in an amphibious operation, then marched overland to take Mexico City.
In the congressional debate over the Wilmot Proviso, southern spokesman argued that Congress had no authority to ban slavery from any territory of the United States.
Michigan Senator Lewis Cass's idea to allow a territory's residents to vote on whether or not slavery would be legal in their territory was called .
In the 1848 presidential election, antislavery Democrats and northern abolitionists helped found the party and dedicated it to opposing the territorial expansion of slavery.
The death of President , who insisted on his own plan to bring California and New Mexico directly into the Union, broke the deadlock in Congress and cleared the way for the Compromise of 1850.
Speaking to the proposals that became the Compromise of 1850, New York Senator claimed that a "higher law" than the Constitution bound him to oppose the Compromise.
