Revolt in Venezuela

A desperate nation rises to swear in a new democratic leader.

Will this be the moment that Venezuelans finally reclaim their democracy? Millions dared to hope on Wednesday as they poured into the streets of Caracas and other cities to demand the resignation of dictator Nicolás Maduro in favor of the president of the National Assembly, 35-year-old Juan Guaidó.

In a midday outdoor ceremony surrounded by his supporters, Mr. Guaidó took the presidential oath. He will now have the power to act as interim head of state until new elections are held. Aerial photos captured crowds jamming the...