<span>If Joseph McCarthy put you on the “black list,” that means he probably thought you were a "communist," since this was a time of great paranoia regarding communism in the United States--during the Cold War. </span>
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Ivan Allen Jr. helped to make the sports facilitated infrastructure by bringing in major professional sports teams in Atlanta, which later on helped them to host Olympics in the year 1996.
Ivan Allen Jr. first became the mayor of Atlanta in 1962. He contributed alot in the fight against racism. As he became the mayor, saw the trends of the world, he understood that it is necessary for Atlanta to progress in sports, for it to become a major city. He helped in the construction of their new stadium and brought various professional teams to Atlanta
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Vasco de Gama sailed around Africa to reach India
Medicine. Most of the things we consider medicine are only helpful if we're already in bad condition, taking medicine while being completely fine can have terrible side effects on your body.
Democracy, it keeps away a tyrannical overlord from controlling the control, but sometimes it's impossible for different sections of government to agree on certain things, and this prolongs the process sometimes making democracy seem a little unreliable compared to the fast paced solidified decision of a single ruler.
Eating. Doing anything in excess can be harmful, but especially eating in the case of most Americans. Even with the health reforms of today, and dietary programs, many Americans are obese and suffer from type 2 diabetes simply from over-eating.
Those are just three examples I could think of.