The president most responsible for obtaining the lands of california, oregon, and new mexico for the united states was? a. thomas jefferson b. martin van burden. c. james k. polk. d. john tyler

The president most responsible for obtaining the lands of California, Oregon, and New Mexico for the United States was James K. Polk. Option C is correct.

James Knox Polk was the 11th president of the United States. Prior to his presidency, he was speaker of the House of Representatives and governor of Tennessee. He belonged to the Democratic Party and was an advocate of Jacksonian democracy. During Polk's presidency, the United States expanded significantly with the annexation of the Republic of Texas, the Oregon Territory, and the Mexican Cession following the American victory in the Mexican–American War.

c

explanation:

in february 1787, congress decided that a convention should be convened to revise the articles of confederation, the nation’s first constitution. in may, 55 delegates came to philadelphia, and the constitutional convention began. debates erupted over representation in congress, over slavery, and over the new executive branch. the debates continued through four hot and muggy months. but eventually the delegates reached compromises, and on september 17, they produced the u.s. constitution, replacing the articles with the governing document that has functioned effectively for more than 200 years.