He was Secretary of State under President John Adams<span> from 1800 to 1801. The longest-serving Chief Justice and the fourth longest-serving justice in U.S. Supreme Court history, Marshall dominated the Court for over three decades (34 years) and played a significant role in the development of the American legal system.</span>
B (pls mark as brainliest) i think
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Answer:
Radar
Explanation:
Radar technology employs the use of radio waves in determining the distances speed and location of certain objects. This was instrumental during the war as it helped countries foil secret attacks being planned.
It was used to operate anti-aircraft guns and was used on ships for easy navigation at night and to locate enemy ships and aircraft.