Today in World War II History—July 1, 1941

RCA ad announcing the start of regularly scheduled television broadcasting in New York City by RCA-NBC in April 1939 via station W2XBS, the forerunner of today’s WNBC, June 1939 (public domain via RCA via Wikipedia)
85 Years Ago—July 1, 1941: Germans occupy Riga, Latvia.
US agrees to take over the security of Iceland from Britain.
CBS & NBC begin offering fifteen hours per week of TV programming in New York City, but few people have sets.
Bulova Watch buys first network TV commercial ever—for $9.
Mammoth Cave National Park is established in Kentucky.