Hoover's response to the Great Depression was the Smoot-Hawley tariff which rose tariffs on over 20,000 products. This measure led to retaliation from foreign countries especially from Europe and they rose their own tariffs on their American imports, the American economy was hit back and it explains why Hoover's policy failed.
Hoover was nicknamed "Do nothing" by the Democrats, they blamed him for sticking to Laissez faire economics, but this accusation was wrong as he pushed for more state intervention which eventually failed.
2. The last great gold rush. 1896-1899 also called the Yukon gold rush or the Alaskan gold rush.
World War 1 because as Taskmasters said on this website, "Dadaism was an art movement of the European avant-garde, in the early 20th century, which was heavily influenced by World War I. It was anti-war and anti-bourgeois, and had political affinities with radical left. Some of the key figures of the Dada movement were: Hugo Ball, Emmy Hennings, Hans Arp, George Grosz, Max Ernst, Beatrice Wood, Tristan Tzara, Francis Picabia, etc. The movement influenced later styles in art such as Surrealism, Nouveau Realisme, pop art and Fluxus." (I quoted another guy's answer a.k.a. Taskmasters.
