Historical change doesn't just happen; it has to be fought for. Even when something has changed for the better, you'll still find people trying to fight for the ways of the past. This is Kathrine Switzer running the Boston Marathon in 1967.
Before Switzer, no woman had ever completed the race. Some men would rather things stayed that way, because they didn't believe women should be competing. Switzer outran them, finished the race, and made her mark on history.