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When they stopped conquering people, they stopped taking slaves. Much of the rural economy was built around slavery and there was a pretty firm bias against allowing slaves to have children- the investment in raising a slave child not to mention the loss of productivity of the mother and the possible death or both mother and child during childbirth led slave owners to prohibit much breeding.
Allowing slaves to have children and form family bonds also made them more likely to revolt- humans often fight harder for the rights of their children for their own.
So, without a renewable source of slaves, it became very difficult to run farms and vineyards. Without profitable and productive agriculture, there were less taxes. With less taxes, there were less funds to do civic improvements like maintaining aqueducts and roads and support standing armies.
Emperors decided to raise taxes on everyone to make up the difference which led to the ruin of many private citizens and the marked increase in wealth of the nobility who were often exempt from many taxes (which they voted for, themselves, as senators) leaving them with the funds to buy up neighboring properties and essentially, their neighbors to work the land. Feudalism grew out of a switch from a civic or community focus to a self or family focus.
The Eastern Roman Empire maintained a strong base of taxation and a standing army for a thousand years after the fall of the West, but their economy wasn't nearly as dependent on slaves for labor. They survived by repeatedly reforming their style of government to suit the current needs without ever losing the power of the central government.
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African American soldiers in the US looked to seek to stop segregation. They hoped by contributing in war that they would be able to make people in the US think they should deserve equal rights.
The working conditions of the growing Russian industrial class in St. Petersburg and Moscow "<span>c. Were terrible and left the workers receptive to revolutionary propaganda," since there were no laws that protected workers' rights or safety at this time. </span>
Copernican heliocentrism is the name given to the astronomical model developed by Nicolaus Copernicus and published in 1543. This model positioned the Sun at the center of the Universe, motionless, with Earth and the other planets orbiting around it in circular paths, modified by epicycles, and at uniform speeds. The Copernican model displaced the geocentric model of Ptolemy that had prevailed for centuries, which had placed Earth at the center of the Universe. Copernican heliocentrism is often regarded[by whom?] as the launching point to modern astronomy and the Scientific Revolution.
Heliocentric model from Nicolaus Copernicus' De revolutionibus orbium coelestium (On the Revolutions of the Heavenly Spheres)
Although he had circulated an outline of his own heliocentric theory to colleagues sometime before 1514, he did not decide to publish it until he was urged to do so late in his life by his pupil Rheticus. Copernicus's challenge was to present a practical alternative to the Ptolemaic model by more elegantly and accurately determining the length of a solar year while preserving the metaphysical implications of a mathematically ordered cosmos. Thus, his heliocentric model retained several of the Ptolemaic elements, causing inaccuracies such as the planets' circular orbits, epicycles, and uniform speeds,[1] while at the same time introducing such innovative ideas as:-
The Earth is one of several planets revolving around a stationary sun in a determined order.
The Earth has three motions: daily rotation, annual revolution, and annual tilting of its axis.
Retrograde motion of the planets is explained by the Earth's motion.
The distance from the Earth to the Sun is small compared to the distance from the Sun to the stars.
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