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The factors that sociologists identified that help explain why elderly people fear dependency more than death are having to pay bills, friends and family members that need their help, and basically of their responsibilities.
The negative trait he later developed is psychoticism.
Two other similarities between these three civilizations is the use of a calendar, which they used to predict eclipses, schedule religious ceremonies, and determine when to plant/harvest crops, and go off to war, (more so the Mayas and the Aztecs), and they all had some form of writing system.
The largest proportion of federal revenues comes from taxes from the American citizen population. There are other large sources of revenue, but the current tax code makes for a great deal of revenue.