WWI change modern warfare

Select an event, incident, a legislative action, or related marked historical moment in the years from Reconstruction until today that marks an important transition in American History. This historical event can lead to a social, economic, or political transition that shaped the country’s history. Additionally, you will conclude this research project with a supposition of how history might have been shaped had this event never occurred or of another possible outcome could have been possible.
Examples: How did the new technology of WWI change modern warfare? What could have been the possible benefits and problems if the Freedman’s Bureau continued beyond Reconstruction?