How can you tell that the inca most likely did not use currency ,or money in the form of coins or bills

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

Which of the following could be described as a conservative reaction against the ideas of the jazz age

Which statement about the open door notes is true? a) all european powers rejected them b) they caused war with japan c) nations that received them did not fully accept them d) all the european powers agreed to them