Polk's goal was to spread the United States across the North American continent from the Atlantic Ocean to Pacific Ocean. His goal was to secure the territories of <u>New Mexico </u>and <u>California</u>, which allowed him to extend the United States to the Pacific Ocean.
Distinctive rock sequences on south america terminate at the atlantic ocean but reappear on the continent of Africa. This is evidence towards the theory of Plate tectonics and the existence of Pangaea.
