Answer:
They developed Trigonometry, used mathematical models to track down the planet Jupiter and developed methods of tracking time that are still used today.
The Constitutional Convention limited the power of the executive branch by subjecting the president to checks by Congress, since the goal was to create a federal government free from the possibility of tyrannical rule.
European navigators once sought to find the northwest passage (a sea route), in hope to reach India and China.<span>
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He thought he could free slaves in the rebel states becuz he thought that if he frees slaves than there will be more men in his troops he could use those free slaves to increase the men.and he didn't free slaves in the union part becuz people are already getting mad at him. the reason for this is that all the free slaves are going to take the white peoples jobs in the union.and Abraham didn't want the unions to be more mad at him and eventually go against him
