I think, they rely on primary sources because these sources are original and more trustworthy
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Poll taxes were used to prevent African American men from voting. Because many of the African American men were poor and could not pay the taxes they could not pay the taxes, they could not vote. Literacy test or (understanding test) where they were forced to read and explain the text to a white man.
England wanted to establish an American colony to increase her wealth and power. England hoped to find silver and gold in America. ... Jamestown became the first permanent English settlement in North America in 1607.
Some people consider the way the media covers candidates for public office bad for democracy due to the way they present the facts and evidence. e.g. Whenever Donald Trump was running for presidency they constantly reported on his sexual abuse accusations instead of his good deeds and samaritan actions. He helped in the recovery from the flood in Louisiana and sent food and shelter for the suffering families, but you never heard that on the news... They broadcast the information in a way that will attract the most viewers, not in a way that delivers the most factual and true information.