In 1976 a historian is writing a book analyzing the causes of the American Revolution which was fought 200 years earlier. Which of the following sources would be a primary source he could consult?

A primary source the historian could consult is a letter written by a colonial leader, such as George Washington or Thomas Jefferson, during the time of the American Revolution. Other examples include newspaper articles from the era, official documents like the Declaration of Independence, or personal diaries of individuals who lived through the events. These firsthand accounts provide direct insight into the thoughts, feelings, and experiences of people during that time.