15. why would palestinians living in jerusalem have a difficult time traveling to the west bank they cannot cross national borders. they will have to cross security barriers. the roads are too dangerous to travel. laws prevent travel beyond the city.

They will have to cross security barriers. This often lasts many hours as checkpoint soldiers have to check many people who are waiting in a line during rush hours. This means that people who work in the West Bank have to leave very early from their houses to cross security barriers or checkpoints, even if the location where they work is not that far. The security searches may be lengthy as well if the car has to be checked, which sometimes can be an extensive search. 

The real causes of World War I included politics, secret alliances, imperialism, and nationalistic pride. However, there was one single event, the assassination of Archduke Ferdinand of Austria, which started a chain of events leading to war.

Explanation:

The immediate cause of World War I that made the aforementioned items come into play alliances imperialism militarism, nationalism was the assassination of Archduke Franz Ferdnand of Austria-Hungary.This assassination led to Austria-Hungary declaring war on Serbia.