Answer:
The (non-existing) communist threat.
Explanation:
The. Berlin Blockade (1948-1949) can be seen, in retrospect, as the start of the Cold War. The Sovjets blocked the Western sectors of Berlin as a protest to the introduction of the Deutsche Mark in Berlin. This event troubled the already tense relationship between the two world powers.
Now it must be said that from the beginning the wide-spread belief that the U.S.S.R and it´s communist comrades (Cuba) was going to complete what Hitler couldn´t manage, i.e. conquer the whole world, was, in retrospect, an absurd idea from the American side.
This by paranoia fueled belief - see for more information Eric Hobsbawm in <em>The Age of Extremes </em>- was shown clearly in the Truman Doctrine, the failed invasion in Cuba and the Cuban Missile Crisis, not to mention the Vietnam War in which several American presidents <em>¨tapped their way through a dense cloud of incomprehension, confusion and paranoia.¨ </em>Eric Hobsbawm
Answer:
The first Western civilization known to have developed the art of navigation at sea were the Phoenicians, about 4,000 years ago (c. 2000 B.C.E. ). Phoenician sailors accomplished navigation by using primitive charts and observations of the Sun and stars to determine directions.
Explanation:
Despite these early beginnings, it would take many centuries before global navigation at sea became possible. Until the fifteenth century, mariners were essentially coastal navigators. Sailing on the open sea was limited to regions of predictable winds and currents, or where there was a wide continental shelf to follow. Farther ventures were enabled by the development of scientifically and mathematically based methods and tools.
Answer: it challenged what people thought was true at the time and it scared them. Those in authority at the time wanted to silence anyone that supported change. A prime example of this was the persecution of Gelileo because he supported the idea of the Heliocentric Theory, or the theory that the sun is the center of the solar system rather than the Earth being the center.
Explanation: have a nice day and good luck on your assignment :)
