The Proclamation announced the acceptance of black men into the Union Army and Navy, enabling the liberated to become liberators
Based on the options given, the most likely answer to this query is depression and heart disease are correlated, and the risk of heart disease can be reduced by treating depression.
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Bystander effect or the bystander apathy as it is also known
is a psychological phenomenon which states that people are less likely to help
a person in need if a group of people is also present nearby. In the tragedy of Kitty Genovese not one
of the 38 neighbors called the police. This shocking death is one of the most
horrible examples of the bystander effect.
If I understood your question correctly, then the answer is "it depends". Sometimes, individuals have a large impact on starting a war (think World War I where one individual caused the war to start), other times groups of people have also important roles in starting a war (think World War II).