NPR News Now covers the closing day of the Republican National Convention in Dallas, where JD Vance delivered a keynote urging voters to elect Republicans to protect the nation from "radicals." The report also details a federal appeals court ruling blocking USPS changes that could disrupt mail-in voting, alongside two new measles-related infant deaths in Pennsylvania. Additionally, the episode notes major stock market declines following a spike in oil prices, significant layoffs at McClatchy media, and the death of Japanese baseball legend Iso Harimoto.