James Polk's Top Priority as President Was To

James Polk's top priority as president was to:

A) restore American prosperity through expanded trade relations with Canada
B) secure geographic expansion of the United States, especially through the acquisition of Texas, California, and New Mexico
C) commit the United States to protecting Texas independence in perpetuity
D) create a political consensus that saw the two major political parties merge into one
E) encourage European immigration as a means to fuel American industrialization