There were four common stages of growth in the life of an empire. Which of the following indicates the adult phase:
A leader begins to conquer adjacent lands and absorb other smaller civilizations.
Leaders gather together to determine how they should expand.
Artisans are well-provided for and impact their culture.
Outside forces begin to pick off villages and land.

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 a. primary sources are historical documents, and secondary sources are modern-day documents.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