Airplanes were vital for ww1 to ease transport of amo and soon guns on the planes including bombs this made it easier for to launch quick air strikes on places like bases vulnerable to air strikes
The answer is D
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It's a big giant piece of paper with a lot of people's names on it and basically tells the first ten human rights.
The main message that the Roosevelt Corollary sent to the rest of the world was that the United States was a powerful force that would intervene in European issues in South America if necessary.
