Answer :

In the 1920s, the main security concerns in the U.S. were related to various threats. Let's break down each option to determine which one was not a security concern during that time:

1. Cold War:
- The Cold War began after World War II, in the late 1940s, between the United States and the Soviet Union. Therefore, it was not a security concern in the 1920s.

2. Bolshevism:
- Bolshevism refers to the communist ideology associated with the Bolshevik Party in Russia. In the aftermath of the Russian Revolution in 1917, there were concerns about the spread of Bolshevism and communist ideas, making this a security concern in the 1920s.

3. Domestic terrorism:
- During the 1920s, there were instances of domestic terrorism in the United States, such as the Wall Street bombing in 1920 and the rise of the Ku Klux Klan. Domestic terrorism was indeed a security concern during that time.

4. Anarchism:
- Anarchism, advocating for the abolition of hierarchical structures like government, was a security concern in the early 20th century, including the 1920s. The fear of anarchist movements and violent acts posed a threat to security.

Therefore, the security concern that was not relevant in the 1920s in the U.S. was the Cold War. This was because the Cold War era started later, after World War II, and was not a factor during the 1920s.

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