Boeing helped the United States during World War II by operating several bases to train troops.

increasing its shipbuilding activities.

expanding its commercial fishing operation.

becoming a key aircraft producer.​

operating several bases to train troops

Correct answer is (d) becoming a key aircraft producer.

Explanation:

In Washington, Boeing proved to be a very important aircraft producer during the war. Washington proved to be an important place for this manufacturing to happen because of the plentiful amount of aluminum, which is necessary for construction of these planes. That was available in Washington.

the answer to your question is a. the salt plains

in 1811, he led an expedition, known as the george c. sibley expedition, to improve relations with the pawnee and kansa tribes, and also to locate the rumored jefferson's salt mountain

frederick the great and the war of austrian succession. frederick william of brandenburg-prussia trained his son, frederick, to be a hardy soldier. he also declared himself king of bohemia, and maria theresa sent troops to retake bohemia. in august he led 80,000 of these men across the frontier into bohemia, his