What is an other name for oral historians

What was the result of delegates from the democratic party not being able to nominate a candidate in 1860

This map shows north korea and south korea today. how does this map reflect the impact of the korean war?

In ohio in 1872, the cleveland massacre was a violent labor dispute at standard oil refineries in cleveland. a takeover by standard oil of the refineries in cleveland. an attempt to stop standard oil from becoming a monopoly. a failed attempt by standard oil to take over other refineries.