Approving international treaties is an exclusive power to the Senate.
Answer:The heliocentric model that involved the radical displacement of the earth to an orbit around the sun (as opposed to being seen as the center of the universe). Copernicus' 1543 work on the heliocentric model of the solar system tried to demonstrate that the sun was the center of the universe.
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The Alamo. Definition: The Battle of the Alamo was a 13 day siege at a mission in San Antonio that was fought between February 23, 1836 – March 6, 1836 by Mexican forces of about 4000, under President General Santa Anna, against a handful of 180 American rebels fighting for Texan independence from Mexico.
It could be argued that the "serf" was the "property" of the land during the Middle Ages, since under the feudal system that reigned supreme during this time, serfs (or peasants) had very little rights of their own.