A historian might use periodization in order to separate the different cultural and political movements in Ancient Greece. It's a good way to categorize and organize the vast history of Ancient Greece, in order to make it more easily understandable. It's also a good way to examine differences in ideals and culture shifts across time.
Answer:
Number of representatives from the district
Explanation:
The Census Bureau within the United States Department of Commerce conducts a decennial census whose figures are used to determine the number of Representatives that each state sends to Congress, and therefore the number of congressional districts within each state.