Hitler was a man of great historical significance—a term that does not imply a positive assessment—because his actions altered the course of history. He was directly responsible for the outbreak of World War II, which resulted in the deaths of over 50 million people. His most amazing accomplishment was rallying the vast majority of German (and Austrian) people behind him. Throughout his career, his popularity was greater and deeper than the National Socialist Party's. Until the very end, the vast majority of Germans believed in him.
The Louisiana Purchase, which was purchased by the United States from France, greatly impacted the development of the US in that it gave the US a large area of land for extremely cheap.
