Sparta I believe... they trained young boys for the military.
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Names can be limiting if your going to look for a job, let's say construction, and your name was Elizabeth. Your name is female and there less likely to pick you then if your name was Bob.
Answer:
They thought it was necessary because they had to check and make sure each branch doesn't go over their limit of power. I hope that answers your question.
Explanation:
I hope this chart helps
The Nile river, it is also the longest river in the world