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

answer: b.

explanation:

it was the "4. potsdam" conference that demanded the unconditional surrender of japan, since it was clear that the japanese would continue to find until the very last man otherwise.