Answer:
The transcontinental railway had a major effect on how Americans perceived thier nation, and it became a symbol of America's growing industrial power and a source of confidence that led them to take on even more ambitious quests.
Because they're put there according to their role of preserving the Republic and expanding their territory ;)
<span>Palmer appointed Hoover as his special assistant so as a response to his fear, Hoover began to hunt down communists, socialists, and anarchists.</span>