C Because if they hadn't discovered agriculture they couldn't grown their own crop
The doctrine that allowed people living in the territories to decide the issue of slavery through their governmental bodies was called popular sovereignty.
The idea of active citizenship
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China didn't have anything to do with citizenship, cities like Athens and Sparta had laws about citizenship and what a citizen could do and what a non-citizen could and couldn't do. China didn't have anything like that at the time/\.
War used to be a grand thing before WW1 when it was considered honorable for men to go out and fight for their country. Even today, it still inspires a sense of nationalism and pride for one's country, though less now than before.
