In the early 1900s, the u. s. navy was nicknamed "the great grey fleet."

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Which areas where seperated by the iron curtain

Brainliesttt !me : ) what brought about the end of the soviet union?

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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.