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What impact did new technologies in the assembly and manufacturing have on the auto industry in the 1920s

How did the completion of the transcontinental railroad change the lives of american citizens? a-it increased the wealth of all americans and enabled them to travel more.b-it made cross-country travel too expensive for ordinary americans.c-it decreased the safety of americans who moved to settle the plains.d-it shortened travel time between the east and west for all americans.

Which of these events was a severe setback for the u.s. war effort in the pacific?