One possible top story could be a sports event. For example, a major championship final in a popular sport like football or tennis. Or perhaps there was a significant discovery in the medical field, such as a new treatment for a common disease being announced.
Maybe there were stories about climate change initiatives being launched on July 19. It could also be that a new movie got a huge amount of hype and was set to release around that time.
It's possible that in the political arena, there were important diplomatic meetings or announcements on July 19. Another aspect could be in the tech industry, where a new startup might have received a large amount of funding, which could be considered a top story in the business and tech community.