Which sentence states a fact? Alaska's Denali, formerly known as Mount McKinley,is the highest mountain peak in North America. Alaska, which has three major mountain ranges, is a great state for mountain climbing.

The sentence that states a fact is: "Alaska's Denali, formerly known as Mount McKinley, is the highest mountain peak in North America." This statement can be verified with factual information. The other sentence, "Alaska, which has three major mountain ranges, is a great state for mountain climbing," is more of an opinion as it is subjective and may vary from person to person.