The Necessary and Proper Clause, also known as the Elastic Clause, is a clause in Article I, Section 8 of the United States Constitution: The Congress shall have Power...
<em>Following the German retreat from the Marne River in July, Gen. Ferdinand Foch and the Allied high command designed a series of convergent and practically simultaneous offensives against the shaken German armies. One was a joint operation in the Meuse valley toward the Mézière and Sedan rail centre.</em>
The assassination resulted in Austria-Hungary declaring war on Serbia. There were already existing war plans so this was the match that started the fire so to speak.