Answer:
The Constitution established a Federal democratic republic. It is the system of the Federal Government; it is democratic because the people govern themselves; and it is a republic because the Government's power is derived from its people.
Few events have a worst impact than the ww1.
This is of course impossible to tell, but most agree that if the Articles of Confederation hadn't been replaced by the more powerful Constitution, the federal government wouldn't have had the power to tax the states and therefore wouldn't have been able to re-pay its war debt--causing the new nation to crumble.