Until after the Korean War, African American soldiers typically served in units that remained segregated from white units
3. operated combat artillery
C. functioned as officers over fellow soldiers
D. served as ambassadors to enemy fighting units

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.