The U. S. Constitution gives citizens the right to vote for the president. This is an example of
A. representative democracy
B. federalism
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C. checks and balances
D. separation of powers

The telegraph, the transatlantic telegraph cable, and the telephone were important to businesses after 1850 because of a. they created a system for developing new inventions. b. they filled a need that other inventions of the day could not. c. they attracted investors and created the stock market. d. they made picture-taking a popular american pastime.