Historical Question: Who was present at the signing of the Declaration of Independence?Which source do you trust more? Which source is more credible: Source 2: Book written by a famous historian who is an expert on the American Revolution, published in 1999.. Historical Question: What was slavery like in South Carolina?Which source do you trust more? Which source is more credible: Source 1: Interview with former slave in 1936. The interviewer is a black man collecting oral histories for the Federal Writer's Project.. Historical Question: What was the layout of the Nazi concentration camp Auschwitz?Which source do you trust more? Which source is more credible: Source 2: Map of concentration camp found in Nazi files.. Historical Question:Why were Japanese Americans put in internment camps during WWII?Which source do you trust more? Which source is more credible: Source 2: Government report on Japanese internment from 1983 based on declassified government documents.. Historical Question: Did American soldiers commit atrocities during Vietnam War in 1969?Which source do you trust more? Which source is more credible: Source 1: Sworn testimony by American Sergeant in Congressional hearings in 1969.. Historical Question: What happened at the Battle of Little Bighorn?Which source do you trust more? Which source is more credible: Neither source is credible.. Historical Question: How do the principles of the Constitution prevent tyranny?Which source do you trust more? Which source is more credible: . Can a secondary source be a credible, trustworthy source: Yes, a secondary source interprets, summarizes, and analyzes primary data. Also, secondary sources include findings based on primary studies.