Oversight and public education are examples of "implied" Congressional functions, since these actions are not specifically mentioned in the Constitution, but are within Congresses' umbrella of power.
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WW1 caused a lot of soldiers to die and also did not bring peace to the world. The Leauge of Nations, that was created after this, made the Treaty of Versaille and only caused more conflict. Finally, WW1 was a huge proponent of disease spreading to more places faster.
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So they have something to rely on