In 1934 the Communists suffered huge losses against the nationalists in the Chinese Civil War. Faced with the prospect of annhilation the leaders of the Comunist army shose to start what is now called the Long March. This was a tactic of withdrawal into mountainous areas, some 2500 miles to the north and west. The purpose was simple: survival. By undertaking a tactical withdrawal the Communists could ensure that they still had an effective fighting force; could select easy to defend locations; could regroup and could ensure that the Nationalists supply lines were long and susceptible to attacks.
Answer: South pass is the wide gap in the Wind River Range of the Rocky Mountains.
Explanation:
The British government imposed many taxes, duties and fees on the colonies. These taxes, duties, and fees burdensome to the colonists. The British also forcably required quartering of troops in private houses. Some of the most imposing burdens on the colonists wer the sugar act, stamp act, tea act, revenue act, and quartering act. these are a few but there were more.
B. Hydroelectric.
(Edit: Why did you ask the question if you had the answer?)