<span>John Chapman, called Johnny Appleseed, was an American pioneer nurseryman who introduced apple trees to large parts of Pennsylvania, Ontario, Ohio, Indiana, and Illinois, as well as the northern counties of present-day West Virginia</span>
He's also interested in the Constitution.
Mercantilism is an example of an economic system, so your answer is C! :D
The ghazu were military expeditions or raids and after the emergence of Islam meant religious warfare. Ummah is a word from the Arabic language which means nation or community. It is commonly used to describe the collective community of people who practice the religion of Islam.