What was a major cause of nativist attitudes during the 1920s?
a. emergence of the second ku klux klan
b. the growing diversity of languages, customs, and religions in the u. s.
c. the controversial trial of nicola sacco and bartolomeo vanzetti
d. the intense debate surrounding teaching evolution in schools

the controversial trial of Nicola Sacco and Bartolomeo Vanzetti was a major cause of nativist attitudes during the 1920s.

Option C

Explanation:

During the early period of 20th Century, there was influx of immigrants in U.S. giving rise to the nativism in America.  This led to growing diversity of religion, language, culture, etc. which caused great fear and anxiety in the minds of the natives and also led to the adoption of racial attitude towards the immigrants.

Nativism saw its zenith during the trial of Bartolomeo Vanzetti and Nicola Sacco who were the immigrants from Italy and they were accused of robbery and murder. Despite the lack in incriminating evidence they were declared guilty by the jury and finally executed on 23rd August 1927.

it was a act of seld fesnse more over it was a peace treaty between the fogein contunries.