Answer:
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 main reason why <span>Lincoln waited to announce the emancipation proclamation was because he didn't want to make the Union seem weak, and as if it were desperate. That's why he waited until after a solid Union victory. </span>
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