Although historians have studied cities for centuries, in which of the academic disciplines listed below were cities first studied systematically?

According to the method of agreement, if two or more examples of a particular phenomenon have only one of several possible causal attributes in common, then the attribute that all the cases share is the cause of the outcome

Indicate whether this statement is true or false.

The main distinction between a nation and an ethnic group is ______.

A. a nation either has or seeks control of a state B. an ethnic group is connected by blood ties, whereas a nation is not C. nations are more culturally distinct D. ethnic groups are less important to politics