Answer:
the first radio serial considered to be a "soap opera" was Painted Dreams, which debuted on October 20, 1930 on Chicago radio station WGN.
The first nationally broadcast radio soap opera was Clara, Lu, and Em, which aired on the NBC Blue Network at 10:30 p.m. Eastern Time on January 27, 1931
The first daytime TV soap opera in the United States was These Are My Children in 1949