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Your answer is “A” checks and balances
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The correct answer is cars.
The development of the Eisenhower Instate System during the 1950's resulted in the creation of an enormous amount of interconnected freeways and highways throughout the United States. With these new roads available, there was a significant increase in buying cars. This is because now citizens could travel from city to city and state to state on a much easier basis than ever before.
Johnson was unwillingly caught up in the hot battle (Vietnam War) of the Cold War. Johnson was the US's only Presidential Administration to be destroyed by the war. He went on nation wide television and flat out said he would not run for president again, and would NOT ACCEPT nomination for the presidency of the United States. He was truly fed-up with the war.
I believe the correct answer is governor.