What role did nationalism have in the changes that occurred in europe in the 1800s?

Which of the islamic empires (ottomans, mughals, safavids) were the most influential and why?

The author of the article, arthur brooks, has been president of the american enterprise institute since 2009, an organization committed to protecting free enterprise in the united states.he is the author of several books, including "the road to freedom: how to win the fight for free enterprise."

What is human effort in human effort economics