Why were helicopters used in the Vietnam War? Select all that apply The U. S. used helicopters to drop Agent Orange on the forests

The U. S. could not easily tell what was happening on the ground, so helicopters allowed them to see

They fought Vietnam in the air using helicopters

Vietnam did not have helicopters so we could attack them from the sky

Experimented with communism before taking part in a number of civil rights and antiwar protest

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.

What is the waterway that links the atlantic and pacific ocean