Answer:
One political catalyst for U.S. imperialism during the late 1800s and early 1900s was the desire for military and strategic advantages. The U.S. sought to establish naval bases and coaling stations around the world to protect American interests and project military power.
One social catalyst was the belief in cultural superiority and the desire to spread American values and institutions around the world. This was fueled by a sense of manifest destiny and the belief that it was the United States' duty to spread democracy and Christianity.
One economic catalyst was the desire for new markets and resources. With the rise of industrialization, the U.S. needed new sources of raw materials and new markets to sell its goods. Colonies and territories offered new opportunities for trade and investment, and the U.S. sought to expand its economic power through imperialism.