A) The urbanization of the United Stats quickened due to technology improvements.
-This whole paragraph is on the subject of how technology quickly urbanized the United States. All of the other answers are factors that caused this to happen.
Hope this helps!
Its A. IF YALL DONT KNOW THE ANSWER DONT POST. THE CORRECT ANSWER IS A
<span> id say its because at this time, Walter Cronkite delivered his famous "unwinnable war" speech! </span>
