What is the most significant and lasting legacy from the presidency of James K. Polk? A. The Oregon Treaty of 1846

B. Vast land acquisitions

C. The re-establisment of the U. S. Treasury

D. The founding of the Naval Academy

B

Explanation:

Polk's administration was notable for territorial expansion, including the Oregon Territory and the Mexican Cession.

Most important thing to note is the territorial expansion so please get confused with A because it was the treaty itself it was the land

could you send me the choices?

might be agreeing to participate ethically with other european nations in the slave trade

or notifying other european nations when taking possession   of african territories