Answer:
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I believe the answer is D: Seperation of Powers. This is the most likely answer because the constitution creates a separation of powers between the three different branches of government. The legislative branch drafts creates bills, which then are voted on by both the senate and congress, then the executive branch which is the president would sign the bill into law or veto it, (if the president vetoes a bill congress needs 2/3 of the members to override the veto). The judicial branch would then look over any bills that have been drafted to confirm that they are constitutional.
It was a swift succession.
Johnson was sworn in a hurry given the assassination of John F.
Kennedy. This was to ensure the
stability of government during this traumatic period. Though he started his term well, Vietnam
turned public opinion against the government.
Ancient Egypt went through a series of occupations and suffered a slow decline over a long period of time. First occupied by the Assyrians, then the Persians, and later the Macedonians and Romans, Egyptians would never again reach the glorious heights of self-rule they achieved during previous periods.
The best concise answer to this would be the Louisiana Purchase as it accounts for a large portion of land that is approximately half to a third of the current United States, but at the time more than doubled the size of the country.