Many drugs are addictive, and have high demand. Most addicts will do anything for drugs. The problem cant be solved by enforcing laws and eradication, it will end up finding a way back to the user.
WW1 helped spread the spanish flu and kill off thousands as a result of the cramped quarters of soldiers.
B. Immigration, economic reform and unemployment rates post-recession, and political elitism and nationalism that created bipartisan within Parliament
Big business shaped the American economy in the late 1800s and early 1900s by outproducing smaller "family business," which drove prices down. This happened in large part due to the Industrial Revolution.
27 years old is your answer to the question