Question

the irrational fear of immigrants promoted during the first red scare contributed significantly to what development in the 1920s?
the crash of the stock market
the resurgence of the ku klux klan
the signing of the kellogg - briand pact
the ratification of the nineteenth amendment

Explanation:

The First Red Scare's anti-immigrant, nativist fear aligned with the Ku Klux Klan's 1920s revival, which targeted immigrants, Black people, and other groups. The stock market crash (1929) was unrelated to this fear, the Kellogg-Briand Pact focused on peace, and the 19th Amendment (women's suffrage) was ratified in 1920, independent of the Red Scare's immigrant anxiety.

Answer:

the resurgence of the Ku Klux Klan