Answer:
According to Ptolemy, all the celestial objects such as the moon, the sun and other planets moves around the earth in a circular path. This means that the earth is located at the center of the solar system.
He made a combination of eccentricity and an epicyclic model in order to explain the motion of planets.
This concept was created because he noticed that some of the planets moves in the western direction, rather than in the eastward direction, with respect to the stars that are present in the sky.
A strong military and a decentralized government
The answer is Appalachian Mountains
The <span>Appalachian Mountains are located in the Eastern United States and for the earliest settlers, they posed as a barrier for westward expansion.
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These are a large mountain range that spread across Georgia, Maryland, North Carolina, South Carolina, New York, New Jersey and numerous other US States, stretching as far as Newfoundland, Canada
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