Which president was the first to broadcast the state of the union speech on the radio? write a sentence explaining why it might be important to have the speech on radio or tv.

President Calvin Coolidge was the first President of United States to broadcast the state of the Union Speech on the Radio. Growing importance of Radio and the requests received at the White House made him use Radio to his advantage. He pointed out the increasing value of Radio for securing public support in the forthcoming election. There was a Multi-Station Radio Hookup through which all section of the country listened to him.

your list doesn't mention any of them at all.

and what does "these" mean anyway ?

i think it was   tsar alexander ii