 Joining UPI in 1939 as a war correspondent, he covered the Nuremberg war crimes trials following World War II. Cronkite's rise to television prominence began with the 1952 Republican National Convention .
<clarity>  Joining UPI in 1939 as a war correspondent, he covered the Nuremberg war crimes trials following World War II. Cronkite's rise to television prominence began with the 1952 Republican National Convention .
 Joining in 1939 as a war correspondent, he covered the Nuremberg war crimes trials following World War II. Cronkite's rise to television prominence began with the 1952 Republican National Convention .