The legislative branch makes laws, but the President in the executive branch can veto those laws with a Presidential Veto. The legislative branch makes laws, but the judicial branch can declare those laws unconstitutional.
In 1898, President McKinley sent the U.S. battleship Maine to protect American citizens and interests in Cuba. Shortly after arrival in Havana Harbor, the USS Maine unexpectedly exploded! The sinking of the USSMaine killed 263 U.S. sailors and shocked American citizens at home. No one knew why the USS Maine exploded.
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The correct answer is D) problematic because users often are aware of and do not give consent for their participation.
The use of social media to do psychological research is problematic because users often are aware of and do not give consent for their participation.
Social media is not the best place and way to conduct formal and serious psychological research. Social media has other uses, mostly entertainment and distraction.
To do serious research, psychologists have to form groups with certain characteristics, depending on the purpose of the research. Sometimes, people have to be in the right kind of environment to help get better results.
Carnegie decided that he was going to be a capitalist who concentrates on one industry - the steel industry. He constructed his first steel mill in the around 1875. The profit he made from this steel mill allowed him to buy up other nearby steel mills. As Carnegie's empire grew, he bought up more of the competing steel mills. His purchase of Allegheny Steel contributed to the formation of his monopoly because it was one of his last major competitors. The definition of a monopoly is a company or enterprise that is the only seller of a certain product. By the time Carnegie had finished buying up his competitors, his company was the only company left in the steel industry.