How did Cyrus the Great keep subjects loyal in the Persian Empire?

What role did the alliance system play in preventing austria-hungary and serbia from coming to a compromise settlement?

Brainliestttme : ) how did the soviet union try to maintain control?

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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