What is the Red Scare?
What world history event helped to create the hysteria?

The red scare was a period in U.S history when people feared communism, and wished for the containment of it. This led to mass paranoia in the states. The rise of communism in nations like the soviet union led to this surge in fear, as Americans feared that nations that practiced communism. The rise of the soviet union and other events like the russian revolution in 1920 are examples of events that spread hysteria

Explanation:

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The Red Scare was hysteria over the perceived threat posed by ... agents helped build the case against Julius Rosenberg (1918-53) and his wife, ... Public concerns about communism were heightened by international events.

Explanation:

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since most of current immigration into the u.s., both legal and illegal, is coming from latin america. it would be very difficult to imagine or rationalize a country my fellow citizens are trying desperately to flee into, would pose a threat to my prosperity or freedom. since the u.s. has a long history of intervention, but no record of permanent occupation, i would not feel oppression is the main objective.  

the largest free trade nation, along with the largest gdp in the world wanting to expand it's economic policy on us, and including us, could only be positive. the u.s. government has no interest in, or way of simply forcing american culture on us. and has no track record of it. other nations that adopted american social culture, or "americanization" did so voluntarily, mainly through the choice of allowing american businesses and u.s. citizens to come into their nations, as free operatives.