The public school students' <em>silent</em> protest, by using <em>symbols</em>, in the form of armbands, during school time, cost the students a suspension, because it was considered a <em>violation of a school rule</em>. After the case had been judged by the Supreme Court, they finally won the case. But the outcome could be different, if their protest used "indecent speech" or promoted illegal drug use.
Technological advancements in almost all fields of study (medicine, finance, literature, etc...) have contributed to the development and increase of the U.S economy, as new businesses and products are being created which boost revenue and overall GDP.
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The answer is berlin, because after the war Germany was divided and it was communism and capitalism
The Soviet Union mostly had organizations and agencies that would carry out communist policies and often remove anyone who would try to oppose them. Most known for this was the KGB who covered up many such cases.