Which pre-Columbian civilization would have most benefited from the volcanoes in the Andes mountain range

Why is it useful for historians to base certain studies on the analysis of historical themes

What did roosevelt believe was a common cause of both bank runs and the great depression?

June 19 is often a holiday in texas. it is emancipation day. what important event happened on emancipation day? a) it marks the end of slavery in texas. b) it marks end of the texas revolution. c) it marks the day texas became a state. d) it marks the last battle of the texas revolution.