D
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Answer:
B England taking over Argentina as a colony
The main reason why the twenties are sometimes called an "age of prosperity", especially in the United States, is that "<span>A.Incomes throughout the United States grew and the middle class held most of the wealth," due mostly to speculation in the stock market. </span>
The project D. Building the Transcontinental I believe is the one that led to the creation of a system of time zones across America
