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Answer:
They were both developed in reaction to World War I.
Explanation:
While Dadaism which started around 1913, is a movement in which some artists rejected the logic, reason, and aestheticism of modern capitalist society, by displaying nonsense, irrationality, and anti-bourgeois protest in their works, and at the same time maintained political interest with the radical left.
Surrealism, on the other hand, was popular between 1920s and 1930s, and tried to access the subconsciousness of people and then translate this flow of thought into form of art.
Hence, Dadaism and Surrealism were both developed in reaction to World War I.
That depends on what you consider to be resistance. Most of them stopped during the 19th century after numerous acts and policies that were widely accepted since everyone wanted to avoid bloodshed. Some would argue that it lasted until the 1920s, when the final acts of attacks were held in countries such as Utah, but this was on a really small scale.
Answer:
It gave the Allies the advantage to win the war
