Which president was the first to openly campaign using Twitter as a source? A. Barack Obama B. Donald Trump C. George W. Bush​

Why might collective bargaining fail, causing a union to go on strike? a the union agrees with the boss about wages. b the boss compromises about work hours. c the factory goes out of business, causing the workers to lose their jobs. d the boss refuses to address dangerous working conditions in the factories.

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What was the purpose of the u.s navy's convoy system