Aristarchus’ only extant treatise is “On the Sizes and Distances of the Sun and Moon.” In it he calculated the diameter of the Sun as about seven times the diameter of the Earth, thus estimating the Sun’s volume as about 300 times the volume of the Earth
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The last battle of the war was the Siege of Yorktown. The Continental Army sorrounded the British fortified position and the French ships blasted it from the sea. It ended with the surrender in the field of the British commander Gen. Charles Cornwallis on October 17, 1781.
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2)Sunni Ali led military conquests, while Askia Muhammad founded centers of Islamic learning.
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The 13th Amendment
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United States Constitution provides that "Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction."
The factor that attracted immigrants and Americans to migrate from rural areas to cities was the supply of work in factories.
<h3>Why was there a migration to the cities between the end of the 19th century and the beginning of the 20th century?</h3>
Between the end of the 19th century and the beginning of the 20th century, there was a great internal migration in different countries that tended to migrate from rural areas to urban areas (cities). This phenomenon occurred mainly due to the supply of labor in the factories.
In general, from the beginning of the Industrial Revolution in the 17th century, factories became more relevant and the crafts that were done in rural areas lost relevance. Due to the above, people who lived in rural areas had to face unemployment and were forced to migrate to the cities and work in factories.
On the other hand, cities offered access to services such as education, health, public services and others that could not be easily found in rural areas. So the migrants saw in this displacement an opportunity to improve their lives.
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