Final answer:
Theodore Roosevelt symbolized expansionist beliefs through his actions and policies, advocating for a strong military, conservation of natural resources, and expanding American influence globally.
Step-by-step explanation:
Theodore Roosevelt symbolized the expansionist beliefs through his actions and policies. He played a significant role in expanding American influence globally and establishing a new foreign policy approach. Roosevelt believed in the importance of a strong military as a deterrence, famously quoting the proverb, "Speak softly and carry a big stick." He also advocated for the conservation of America's natural resources and played a key role in the creation of national parks and wildlife refuges.