What items could serve as a primary source for a historian studying the American civial war?

Primary sources for a historian studying the American Civil War include letters and diaries written by soldiers and civilians, official government documents such as the Emancipation Proclamation, and photographs from the era. Other valuable sources include newspapers published during the war, battle maps, and personal artifacts like uniforms or weapons. These items provide firsthand accounts and direct evidence of the experiences and events of the time.