Final answer:
The statement is true; opposition to the war and the Soviet revolution in Russia in 1917 led to the Red Scare, characterized by fear of a communist revolution in the United States.
Step-by-step explanation:
Opposition to the war and the Soviet revolution in Russia in 1917 led to what was called the Red Scare, which is true. The Red Scare refers to the widespread fear and paranoia in the United States about the potential of a communist revolution similar to the Bolshevik Revolution in Russia. The discovery of letter bombs in 1919 and the bombing incidents, such as the one at Attorney General A. Mitchell Palmer’s house, escalated these fears, leading to the Red Scare and encompassing fear of anarchists, socialists, and other radicals. Fear was further fueled by events like the Red Summer, racially motivated riots, and the Palmer Raids. Efforts to combat perceived threats included passing laws against advocating the overthrow of the government and taking civil liberties away from individuals seen as radical or foreign.