The Espionage and Sedition Acts prevented people in the United States from doing what during World War One

From undermining war effort or speaking bad against the government

Explanation:

The espionage act of 1917 and the Sedition act of 1918, made every disloyal or abusive language against the u items states military and government a criminal offense.

The president was afraid that a ti war speeches would undermine the efforts they were putting in at the war. The act also targeted socialists, anarchists, pacifists. Any one who violated could spend up to 29byears in prison and fine 10000 dollars

the answer is bastille