To "scour" means to clear an area or region of enemies or outlaws (i.e. "scour the area for our enemies and make sure they are eliminated). To "search" is to examine an area or region with the intention of locating something or someone. "Scouring" involves locating and eliminating an enemy; to search is to simply locate someone or something.
B) computer, because the space program required equipment that could perform very complicated calculations.
The correct answer is "Elected leaders were capable of abusing their power."
For Lyndon B. Johnson, he abused the powers given to him in the Gulf of Tonkin Resolution passed by the United States Congress. His massive escalation in Vietnam despite the lack of US success shows how he abused his executive power.
For Richard Nixon, he tried to cover up a huge break in to the Democratic National Convention headquarters at the Watergate complex. He tried to use the excuse of "executive privilege" as a means to keep his recorded conversations from the American public.
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1 amendment, the right to petition