Without the assassination, there would be no WW1 (possibly, Europe probably would've found another reason to start WW1 soon enough, they were itching for a fight), and hence no WW2 (at least in the way we had it). Assuming that it's different enough that Japan doesn't end up getting beat by America, they wouldn't have had the same industry as they had post WW2, thus, no Honda, thus, no 2019 Honda Civic.
