How were African Americans denied their rights during reconstruction

How was the government that was created at the constitutional convention similar to the one proposed in the virginia plan?

What was the focus of the stanford study-pls

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.