Was the great depression global or restricted

It was kind of global. A 19% unemployment in Canada, and in Germany, Japan, and Italy, they started to like the ways of famous dictators in other countries, and in Germany's case, their own depending on who you were.

The Great Depression was a global, worldwide fall of the economy. The hardest and longest experienced, as it started in 1929 and was in place for at least a decade. Although it started in the United States due to the crash of the Wall Street stock market, it affected everywhere around the world.  

b) race riots in several cities

it refers to race, i am pretty sure this was a popular term in nazi germany or something.