C. Both the GNP and the percentage of high school graduates rose.
The modern development of today's world would have first made the routes safer. Today we have the safety of common things such as police officers, hospitals, e.t.c. Transportation of goods would have been easier, and it would have been easier to carry larger amounts of goods at one time.
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The Warren Court typically made decisions that bolstered the privileges of needy individuals, minorities, or other burdened gatherings. Both Kennedy and Johnson attempted to enhance life in the United States by diminishing neediness and advancing sexual orientation and racial correspondence. The Warren Court bolstered and mirrored these strategies by including similar gatherings, settling on the court choices and the social arrangements cooperate.