How has the authority to send troops to war changed since ww2

The Congress shall have the power to make all laws necessary and proper for carrying into execution, not only its own powers but also all other powers vested by the Constitution in the Government of the United States, or in any department or officer thereof.  The constitutional powers of the President as Commander-in-Chief to introduce United States Armed Forces into hostilities, or into situations where imminent involvement in hostilities is clearly indicated by the circumstances, are exercised only pursuant to (1) a declaration of war, (2) specific statutory authorization, or (3) a national emergency created by attack upon the United States, its territories or possessions, or its armed forces.  The War Powers Act allows the president to go to war without the consent of congress in that it says the president should consult with congress when it is possible. After engaging troops, the president is required to consult with congress and provide periodic (every 6 months) reports to congress. The War Powers Act allowed congress to claim some power over war while abrogating their responsibility. These powers were challlenged by Clinton in Bosnia, Bush in the Gulf War and by Junior in Afghanistan and Iraq. The only powers left to congress is the power to finance the war. They could shut down a war by simply refusing to finance it.  Within sixty calendar days after a report is submitted or is required to be submitted pursuant to section 4(a)(1), whichever is earlier, the President shall terminate any use of United States Armed Forces with respect to which such report was submitted (or required to be submitted), unless the Congress (1) has declared war or has enacted a specific authorization for such use of United States Armed Forces, (2) has extended by law such sixty-day period, or (3) is physically unable to meet as a result of an armed attack upon the United States. Such sixty-day period shall be extended for not more than an additional thirty days if the President determines and certifies to the Congress in writing that unavoidable military necessity respecting the safety of United States Armed Forces requires the continued use of such armed forces in the course of bringing about a prompt removal of such forces.

Explanation:

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The Congress shall have the power to make all laws necessary and proper for carrying into execution, not only its own powers but also all other powers vested by the Constitution in the Government of the United States, or in any department or officer thereof. The constitutional powers of the President as Commander-in-Chief to introduce United States Armed Forces into hostilities, or into situations where imminent involvement in hostilities is clearly indicated by the circumstances, are exercised only pursuant to (1) a declaration of war, (2) specific statutory authorization, or (3) a national emergency created by attack upon the United States, its territories or possessions, or its armed forces. The War Powers Act allows the president to go to war without the consent of congress in that it says the president should consult with congress when it is possible. After engaging troops, the president is required to consult with congress and provide periodic (every 6 months) reports to congress. The War Powers Act allowed congress to claim some power over war while abrogating their responsibility. These powers were challlenged by Clinton in Bosnia, Bush in the Gulf War and by Junior in Afghanistan and Iraq. The only powers left to congress is the power to finance the war. They could shut down a war by simply refusing to finance it. Within sixty calendar days after a report is submitted or is required to be submitted pursuant to section 4(a)(1), whichever is earlier, the President shall terminate any use of United States Armed Forces with respect to which such report was submitted (or required to be submitted), unless the Congress (1) has declared war or has enacted a specific authorization for such use of United States Armed Forces, (2) has extended by law such sixty-day period, or (3) is physically unable to meet as a result of an armed attack upon the United States. Such sixty-day period shall be extended for not more than an additional thirty days if the President determines and certifies to the Congress in writing that unavoidable military necessity respecting the safety of United States Armed Forces requires the continued use of such armed forces in the course of bringing about a prompt removal of such forces.

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no every country is held to the same degree as others just some member countries such as the usa and germany are more economically sound so the need to show there support to all others