I think, they rely on primary sources because these sources are original and more trustworthy
Answer:
At its height in 1919–1920, concerns over the effects of radical political agitation in American society and the alleged spread of communism and anarchism in the American labor movement fueled a general sense of concern
Explanation:
Horses and ships were two methods of travel used.
The Answer is Andrew Jackson
The Indies played a great role in history. The land was originally home to the indigenous. After the trans-Atlantic expedition the Spanish settled in the indies area for the first 28 years taking over the land and people.