What exactly was the Hundred Days?(This has to do with FDR...)I need to use it in a sentence to show that I know what it means. So a brief but detailed definition would be nice.

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The Hundred Days has to do with Roosevelt's first 100 days in office, or the initiation of the New Deal.  During this time, he did more than any president before or since has done, creating many social programs like the CCC, AAA, WPA, FDIC, etc. Long Story Short: It was the beginning time where Roosevelt created social programs to boost the country out of the Depression.

the hundred days offensive ,also well known as the grand offensive or canada`s hundred days was the final period of the first world war , this is where the allies launched a series off offenses against central powers on the westren front . this happended from the date of august 8, 1918 to november 11 , 1918 .another thing that it is known to be is napolean which is marked  between the period between napolean bonaparte`s return from exile to eiba forts on the date of march 20, 1815 

ummmm... that event that lasted lke 100 days or something