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In 1952 there were 48 states in the US. They are sometimes referred to now as the 'lower 48', if the matter at hand is relevant only to the contiguous states below Canada. Like Hawaii, Alaska does not border any of the other states. The last two states to join the union were Alaska and Hawaii, both of which joined in 1959.
"Contiguous" means the part that's all connected, all parts physically touching each other. The part of the US in which you could walk or drive to anywhere in it without leaving the country. Alaska isn't contiguous because you can't walk there without going through Canada. Hawaii isn't contiguous because you can't walk there at all. The "contiguous US" is the "lower 48" states.
The highest point in the United States is Mount McKinley, Alaska, at 20,320 feet (6,194 meters). The highest point in the 48 contiguous states is Mount Whitney, California, at 14,505 feet (4,421 meters).
There were 48 states in 1914
48