How dose secondary succession differ from primary succession?

How did southerners view andrew johnson and republicans in congress

Steven pinker states that an important difference exists between men and women in:

Which was the original difference between sunnis and shias? a. they disagreed on the content of the five pillars. b. they disagreed on the role of sharia in muslim society. c. they disagreed on the role of imams in the islamic religion. d. they disagreed on who should have succeeded muhammad.