Describe the motives behind expansion into texas oregon and maine

The reason behind the expansion was to expand the presence of American settlers in the West.

Explanation:

The motive behind the expansion into Texas and Oregon was the Manifest destiny. The Manifest Destiny introduced by the government for the territorial expansion in the West to the Pacific. The main goal was to spread its white American settlers in the westward region. Americans drove towards westward to get access to land across the entire North American continent.

Maine had a different reason for its establishment for the settlers. The first European settlement in the area happened in 1604 by French, and English settlers began to come in the 1620s. Settles came to Maine to start a new life from Europe.

president thomas jefferson commissioned the expedition shortly after the louisiana purchase in 1803 to explore and to map the newly acquired territory, to find a practical route across the western half of the continent, and to establish an american presence in this territory before britain and other european powers