The place to post firsts and lasts in motorsports so for a start off maybe the first event that could be considered a motorsport:

It was on July the 27th of 1811 and it was a race between two steamboats. At Albany NY, the Hope under Captain Bunker and the Clarmont under Captain Bartholomew squared off in a one on one race. Hope took the early lead and essentially won the event when Bunker put a block on Bartholomew as he tried to make an inside pass at a bend in the river. The result was also the first motorsports accident which ended the contest although no one was hurt and neither craft was seriously damaged.