Read this sentence from the president's address. To be sure, we are behind, and will be behind for some time in manned flightBut we do not intend to stay behind, and in this decade, we shall make up and move ahead What convinced people that the United States was behind the Soviet Union A Investments in defense industries in the United States decreased rapidly after the end of World War II B The Soviet Union maintained many more satellites in orbit around Earth during this time period . Scientific advancements in the United States stagnated without World War Il to drive new research D The Soviet Union launched the first artificial satellite and conducted the first crewed orbit of Earth .