de la Palma, May 9th, and later at Monterey and Buena Vista. Scott was
sent to Vera Cruz with an expedition, which fought its way to the City
of Mexico by September 14, 1846. The United States troops also seized
New Mexico. California revolted and joined the United States. The
Gadsden Purchase of 1853 secured a further small strip of territory from
Mexico.

The Boundary Treaty with Great Britain, in June, 1846, established the
northern limits of Oregon at 49th parallel north latitude.

The plans for converting California into a slave state were frustrated
by the discovery of gold. Fifty thousand emigrants poured in. The men
worked with their own hands, and would not permit slaves to be brought
in by their owners. Five bills, known as the Compromise of 1850,
provided that New Mexico should be organised as a territory out of
Texas; admitted California as a free state; established Utah as a
territory; provided a more rigid fugitive slave law; and abolished
slavery in the District of Columbia.

Cuba was regarded as a promising field for the extension of the slave
territory when the Democratic Party returned to power in 1853 with the
administration of Franklin Pierce. The ministers to Spain, France and
Great Britain met in Belgium, at the President's direction, and issued
the Ostend Manifesto, which declared that the United States would be
justified in annexing Cuba, if Spain refused to sell the island. This
Manifesto followed the popular agitation over the Virginius affair. The
Spaniards had seized a ship of that name, which was smuggling arms to
the Cubans, and put to death some Americans. War was averted, and Cuba
remained in the control of the Spaniards.