Final answer:
The Louisiana Purchase was an event that occurred in 1803 and was not a result of the debate over America's economic future, but rather an event that set the stage for future debates about the spread of slavery and economic policies.
Step-by-step explanation:
The debate over America's economic future refers to differences in opinions on how to deal with the expansion of the United States and the issues of slavery in the newly acquired territories. The correct answer, which did not result from this debate, is D. Louisiana Purchase. The Missouri Compromise, the Second Great Awakening, and the American System were all parts or outcomes of the debate over America's future, especially regarding the spread of slavery and economic policy. However, the Louisiana Purchase was an event that happened earlier (in 1803) and although it set the stage for these debates by expanding the United States, it was not a result of the debates themselves.