Martin luther king, jr. gave his "i have a dream" speech during what period of u. s. history?

Although a number of things brought about world war one there was one even that push to europe over the edge. what was that event?

What best describes the transportation within cities in the early 1800s

Which governing principle is best reflected by the representative government created by the constitution a. separation of opwer b. republicanism c. rule of law d. limited government