Why did the islamic empires begin to decline? a. annexing too much land at once b. infighting and weak governments c. the impact of other world cultures d. too many technical improvements

porter is writing economic history because he is focusing on the cost of developing vaccines.

religion played a major role in the american revolution by offering a moral sanction for opposition to the british--an assurance to the average american that revolution was justified in the sight of god. the revolution strengthened millennialist strains in american.