Who declared himself a Republican "progressive conservative," sought to increase efficiency as secretary of commerce, and created the Federal Radio Commission?

Herbert Hoover.

Explanation:

Herbert Hoover became the 31st President of the United States and served his presidency from 1929-1933. During the time of World War 1, he became most notable as a humanitarian. He led a hunger-relief policy in Europe that helped to fight the situation of hunger and poverty in the aftermaths of World War 1.

But, during his presidency, he failed to generate policies to fight the economic crash known as the Great Depression. He declared himself to be "progressive conservative" after leaving office in 1932. In 1921, when Hoover was serving as a Secretary of Commerce, he created the Federal Radio Commission intending to shape the radio broadcasting.

So, the correct answer is Herbert Hoover.

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