The state of a nation which takes no part between two or more other nations at war. Neutrality laws. Acts of congress which forbid the fitting out and equipping of armed vessels, or the enlisting of troops, for the aid of either of two belligerent powers with which the United States is at peace. Neutrality Proclamation. A proclamation by the president of the United States, issued oil the outbreak of a war between two powers with both of which the United States is at peace, announcing the neutrality of the United States and warning all citizens to refrain from any breach of the neutrality laws.