Final answer:
The best statement expressing a theme of "To Roosevelt" is that cultural or military invasions result in casualties, reflecting nationalistic ideals and the consequences of using military power to maintain national strength. The correct option is 4.
Step-by-step explanation:
The statement that best expresses one possible theme of "To Roosevelt" is likely when one country invades another, culturally or militarily, there are casualties. This is derived from the consideration of Roosevelt's notion of masculinity and nationalistic tendencies as mentioned in the quoted passages, alongside with how war and policies shaped civilizations.
Notably, an overarching theme in the literature and philosophy of the time depicts the use of military power and cultural dominance to assert control and maintain national strength. Additionally, there are references to the impacts of war on the respective societies, the conception of victory and nationalistic ideals, further supporting the notion that interference often results in both cultural and human casualties.
Hence, Option 4 is correct.