I have heard some claim that Jar-Jar Binks was responsible for the creation of the Empire. If so, how, and was he the sole reason, or were there other elements?
That scene occurred in Episode II where
Padme had to go back to Naboo so she made him her proxy to the senate.
And then Palpatine
Social engineered him into putting the motion before the senate (by looking at him and saying words to the effect of "if only there were someone brave enough to make this motion"). The motion was that Palpatine be granted emergency powers, which he used to raise a grand army of the republic aka the clone army aka the stormtroopers.
So he was involved, but if he had not done it then Palpatine would have just tricked or ordered someone else to do it