History

A:

The United States got involved in Vietnam to prevent the spread of communism throughout Southeast Asia. The domino theory, prevalent in the U.S. government, posited that if Vietnam became communist, it would lead to communist conquests of surrounding countries; victory in Vietnam was crucial to stopping communist expansion.

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    • What do "BC" and "AD" mean in a timeline?

      Q: What do "BC" and "AD" mean in a timeline?

      A: "B.C." stands for "before Christ," while "A.D." stand for "anno domini," meaning "in the year of our Lord," according to How Stuff Works. This way of delineating the calendar was established in the 5th century.
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    • What kind of government did Sparta have?

      Q: What kind of government did Sparta have?

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    • Who was the first person to discover America?

      Q: Who was the first person to discover America?

      A: The discovery of America is most commonly attributed to Christopher Columbus, as it was he who revealed the Americas to early-modern Europe. Scholars entertain many alternative answers to who discovered America depending on the specific parameters of what constitutes "discovery."
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    • Why did Ferdinand Magellan make his voyage?

      Q: Why did Ferdinand Magellan make his voyage?

      A: Ferdinand Magellan, a Portuguese navigator, sailed west from Spain in the early 16th century in hopes of finding a western shipping route to Indonesia's Spice Islands. With five ships and more than 250 men, he reached Brazil, where he looked along the coast of South America for a strait leading to the Pacific Ocean. After camping in Port St. Julian for the winter, Magellan found the strait.
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    • What are some facts about the Zhou Dynasty?

      Q: What are some facts about the Zhou Dynasty?

      A: Although historians do not agree on the exact starting time, the Zhou dynasty in China lasted approximately from 1046 to 221 B.C. and is the longest dynasty in the history of the nation. It is also called the Chou dynasty. Under this dynasty, most of China operated under one government for the first time.
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    • What weapons did the Babylonians use?

      Q: What weapons did the Babylonians use?

      A: The ancient Babylonians used sharpened weapons such as sickle swords, socketed axes, spears, and the Egyptian-derived bladed mace, as well as clubs and staffs, and projectiles flung from war slings. The Babylonians were a Bronze Age people, so the bladed weapons they used were made of a softer metal than later civilization's iron and steel. This made them less effective in battle than iron and iron-alloy based weapons, as iron is harder and harder blades can take a sharper point.
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    • Who invented the second?

      Q: Who invented the second?

      A: The international unit of the second was first described by the Greco-Egyptian mathematician Claudius Ptolemy in his work "Almagest" around 150 C.E. He defined the second, or second-minute, as one-sixtieth of a minute.
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    • Who invented the first bullet?

      Q: Who invented the first bullet?

      A: The modern bullet is based on a version invented in 1826 by Henri-Gustave Delvigne, a French infantry officer. Delvigne's bullet had a spherical shape and was rammed into a breech's rifling grooves.
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    • When was the first map invented?

      Q: When was the first map invented?

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    • Who invented the cell phone?

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    • Why was money created?

      Q: Why was money created?

      A: Money was originally created to serve as a substitute store of value to bypass problems with the barter system. If you had an apple tree but needed eggs, you needed to find someone with a chicken coop who wanted apples. Currency allows you to perform barter by proxy. You sell your apples for currency, and then you can buy anything you like from traders who accept that currency.
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    • Where was the light bulb invented?

      Q: Where was the light bulb invented?

      A: The first light bulbs and its predecessors were invented in England. John Wilson Swan created the first light that can be considered a light bulb in 1850.
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      Q: What was the job of a medieval knight?

      A: Medieval knights were the professional warrior class of Europe, responsible for defending their feudal lord's territory from rival lords and keeping the local serfdom in line with the lord's rule. Knights were frequently members of the noble class, with the title inherited through the father, but it was also a title granted as a reward for chivalrous deeds. In the late medieval period, noble and warrior classes became more static.
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    • What did medieval knights do?

      Q: What did medieval knights do?

      A: Knights performed military services for lords within a kingdom. Clergymen during the Crusades established a moral code in which a knight must also protect churches, women, orphans and the weak.
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    • How many people died building the Great Wall?

      Q: How many people died building the Great Wall?

      A: The exact number of people who died during the construction of the Great Wall of China is unknown; however, it is estimated that up to 1,000,000 people lost their lives. Over 2000 years ago, Emperor Qin commanded the original construction of the Great Wall of China.
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    • Who won the crusades?

      Q: Who won the crusades?

      A: The crusades were ultimately won in the East by the Muslims when the Bahri Mamluks conquered Acre in 1291. While crusades were mounted even after this point, political witch-hunts mounted against the Knights Templar by King Philip IV of France made further major crusades in the Levant impractical.
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    • What were the negative effects of the Crusades?

      Q: What were the negative effects of the Crusades?

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    • When was the medieval time period?

      Q: When was the medieval time period?

      A: The medieval period encompasses the fifth to 14th or 15th centuries. Historians date this period from the collapse of the Roman Empire until the dawn of the Renaissance.
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