Complete the following sentence: Fearing the threat from Imperial Japan during World War II, the then neutral United States started fortifying Dutch Harbor in 1940, resulting in the construction of the Dutch Harbor Naval Operating Base and Fort Mears that was completed entirely by September 1941 three months before the surprise attack on Pearl Harbor that caused the U.S. to enter the war. ąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąąą
Battle of Dutch Harbor, part of the Aleutian Islands Campaign. ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️ ️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️<unk>️