Answer:
There were several major factors that contributed to the growth of American imperialism in the late 19th and early 20th centuries. One factor was the expansion of the American economy, which led to a greater demand for foreign markets and raw materials. This economic expansion was fueled in part by industrialization, which created a need for new sources of labor and resources. Another factor was the rise of militarism and a belief in American exceptionalism, which led many Americans to believe that it was the country's destiny to expand its influence abroad.