Citizens: see Article I, Section 8, clause 2 of our Constitution (from congress.gov)

In America, we don't guess people into the penitentiary.  And we don't guess our Nation into war.

From https://constitution.congress.gov/browse/article-1/section-8/clause-11/

Browse the Constitution Annotated

Article I  

Section 8 Enumerated Powers

• Clause 11 War Powers

• To declare War, grant Letters of Marque and Reprisal, and make Rules concerning Captures on Land and Water;

  • ArtI.S8.C11.1 Congressional War Powers 
    • ArtI.S8.C11.1.1  Overview of Congressional War Powers
    • ArtI.S8.C11.1.2  Breadth of Congressional War Powers
  • ArtI.S8.C11.2 Declare War Clause
    • ArtI.S8.C11.2.1  Overview of Declare War Clause
    • ArtI.S8.C11.2.2 Historical Background
      • ArtI.S8.C11.2.2.1  War Powers Before the Constitution
      • ArtI.S8.C11.2.2.2  Early Debates on War Powers in the Constitutional Convention
      • ArtI.S8.C11.2.2.3   Make War and Declare War at the Constitutional Convention
      • ArtI.S8.C11.2.2.4  Constitutional Convention Debates on the Power to End Wars
      • ArtI.S8.C11.2.2.5  Declare War Clause and State Ratification Debates on the Constitution
    • ArtI.S8.C11.2.3  Declarations of War vs. Authorizations for Use of Military Force (AUMF)
    • ArtI.S8.C11.2.4  Legislative and Executive Branch Views on the Declare War Clause
    • ArtI.S8.C11.2.5 Supreme Court Jurisprudence and Interbranch Practice
      • ArtI.S8.C11.2.5.1  Overview of Supreme Court Jurisprudence and War Powers
      • ArtI.S8.C11.2.5.2  Quasi War with France from 1798–1800 and War Powers
      • ArtI.S8.C11.2.5.3  War of 1812, Mexican War, and War Powers
      • ArtI.S8.C11.2.5.4  Civil War, War Powers, and The Prize Cases
      • ArtI.S8.C11.2.5.5  Civil War, and Executive and Legislative Powers
      • ArtI.S8.C11.2.5.6  From the Spanish American War to World War I and Total War
      • ArtI.S8.C11.2.5.7  World War II and the Use of War Powers
      • ArtI.S8.C11.2.5.8  Cold War Military Action, NATO, and the United Nations
      • ArtI.S8.C11.2.5.9  International Police Action and the Korean War
      • ArtI.S8.C11.2.5.10  Presidential and Congressional Power in the Vietnam War
      • ArtI.S8.C11.2.5.11  Post-Cold War Presidential Authority and Persian Gulf War of 1991
      • ArtI.S8.C11.2.5.12  September 11, 2001 Terrorist Attacks and War Powers
      • ArtI.S8.C11.2.5.13  Presidential Power in 2003 Iraq War and Other 21st-Century Operations
    • ArtI.S8.C11.2.6  Enemy Property and Congress's War Powers
    • ArtI.S8.C11.2.7  Prizes of War and Congress's War Powers