Which developments most led to changes in the level of presidential power during the 20th century?

A. Presidents increasing use of military force without congressional declarations of war.

Explanation:

answer; i believe the first answer to be (independent; /// and the second answer is (french); good luck

the secretary of state, appointed by the president with the advice and consent of the senate, is the president's chief foreign affairs adviser. the secretary carries out the president's foreign policies through the state department and the foreign service of the united states.