Can someone please help me and write out the answer​

What was eleanor roosevelt's most significant achievement?

Why were presidents andrew jackson and martin van buren unwilling to annex texas? a. they did not want texas to be admitted to the union as a slave state. b. they feared that the annexation of texas as a slave state would lead to political problems within the union. c. they thought that texas was too large to be admitted to the union as one state. d. they did not believe in the idea of manifest destiny.

Which of the following associations is incorrect? a. franklin d. roosevelt-social security b.theodore roosevelt- conservation of natural resources c. franklin d. roosevelt- the panama canal d.theodore roosevelt-the russo-japanese war