Which of the following was a significant challenge in building the panama canal

What method did party bosses use to maintain the power of their political machines?

Which of the following arguments decided the debate over using the atomic bomb against japan in 1945? using the bomb would destroy the armaments still available to japanese forces in japan. using the bomb would demonstrate the power of the united states to the entire world. using the bomb would shorten the war and avoid heavy casualties among invading troops. using the bomb would enable allied forces to invade and take over the japanese mainland

Brainliesttt !me : ) why were the eastern european countries attempting to break free of the soviet union?