Answer:
They are accounts of some event or something that had happened on a topic from people who had some type of direct connection with it.
Explanation:
Examples: Auto-Biography, diaries, speeches, letters, interviews, records, & etc.
South Carolina seceded from the Union. They were worried that as President Lincoln took office, he would appoint anti-slavery supporters to public office.
Fish, access to fresh water, and fertile land for agriculture.