He used a telescope VENUS helped him to confirm it.
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the Cold War- the concept of MAD (mutually assured destruction) where both countries built up their arsenal of nuclear weapons to where if one attacked the other, the attacked could basically destroy the attacker with the stockpile of missiles it had.
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Between 1492 and 1504, Italian explorer Christopher Columbus led four Spanish-based transatlantic maritime expeditions to the Americas. These voyages led to the widespread knowledge of the New World. This breakthrough inaugurated the period known as the Age of Discovery, which saw the colonization of the Americas, a related biological exchange, and trans-Atlantic trade. These events, the effects and consequences of which persist to the present, are sometimes cited as the beginning of the modern era.
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Born in the Republic of Genoa, Columbus was a navigator who sailed for the Crown of Castile (a predecessor to the modern Kingdom of Spain) in search of a westward route to the Indies, thought to be the East Asian source of spices and other precious oriental goods obtainable only through arduous overland routes. Columbus was partly inspired by 13th-century Italian explorer Marco Polo in his ambition to explore Asia and never admitted his failure in this, incessantly claiming and pointing to supposed evidence that he had reached the East Indies. Ever since, the islands of the Caribbean have been referred to as the West Indies.
At the time of Columbus's voyages, the Americas were inhabited by Indigenous Americans. Soon after first contact, Eurasian diseases such as smallpox began to devastate the indigenous populations, which had no immunity to them. Columbus participated in the beginning of the Spanish conquest of the Native Americans, including by enslaving and brutally treating groups of them in the range of thousands. The exact figures and accuracy of some of the accounts of these events are still debated, in part due to an alleged historiographical disinformation campaign.
Following Columbus's death, in 1507, the Americas were named after Amerigo Vespucci, who realized that these continents were a unique landmass. The search for a westward route to Asia was completed in 1521, when the Castilian Magellan-Elcano expedition sailed across the Pacific and reached Southeast Asia, before returning to Europe and completing the first circumnavigation of the world.
Native-born Americans who saw the influx of new immigrants to the United States with concern were called Nativists.
In the late 1800s, due to the huge entry of immigrants in America, a lot of anti-immigration feelings came forward. A huge effect on immigrants coming to the U.S. appeared in nativism. Nativism is a policy when people show favoritism toward native-born Americans.
