O C. They developed some of the math used today
there were 125,000 African Americans who were overseas in World War II.
The answer is. <span>A)It prevented European countries from taking advantage of China's resources.
At that time, China was in a dire state following their war with the Japanese. The open-door policy created by John Hay's was established to make United States able to maintain equal footing to obtain trading relationships with China so it's not fully controlled by the European nations.</span>
if you are talking about WW2 then yes that is why we had the baby boom because we thought we were the best and wanted to celebrate winning the war and coming home alive.