The u. s. entered the war in 1917 because a. germany declared unrestricted submarine warfare. b. of the zimmerman telegram. c. they sided with the allies. d. all of the above circumstances were true.

What is the main difference between primary and secondary sources? a. primary sources are historical documents, and secondary sources are modern-day documents. b. primary sources are derived from museums and archives, and secondary sources are created by history students and academics. c. primary sources are found in ancient places with a rich history, and secondary sources are found in historical journals and blogs. d. primary sources are created during a particular historical era, and secondary sources are created by studying primary sources.