Who was the first American President of all 50 states?

Alaska's admission to the union was on January 3, 1959.Hawaii's admission to the union was on August 21,1959. Both admissions were under the Eisenhower administration.

The name "Alaska" (Аляска) was introduced in the Russian colonial period when it was used to refer to the peninsula. It was derived from an Aleut, or Unangam idiom, which figuratively refers to the mainland of Alaska. Literally, it means object to which the action of the sea is directed.

Alaska is the largest state in the United States in land area at 663,268 square miles (1,717,856 km 2), over twice the size of Texas, the next largest state. Alaska is larger than all but 18 sovereign countries. Counting territorial waters, Alaska is larger than the combined area of the next three largest states: Texas, California, and Montana. It is also larger than the combined area of the 22 smallest U.S. states

Hawaii is the 50th and most recent state to have joined the United States of America, having received statehood on August 21, 1959. Hawaii is the only U.S. state located in Oceania and the only one composed entirely of islands. It is the northernmost island group in Polynesia, occupying most of an archipelago in the central Pacific Ocean. Hawaii is the only U.S. state not located in the Americas.