What was Theodore Roosevelt's national goal after becoming president in 1901?

The correct answer highlights Theodore Roosevelt's focus on building a powerful navy as a significant aspect of his national goal after becoming president in 1901. Roosevelt believed in the importance of a strong naval presence to assert American power globally and support the country's growing interests abroad. This vision was motivated by the idea of "speak softly and carry a big stick," which emphasized diplomacy backed by military strength. Roosevelt's efforts in naval expansion included the construction of the Great White Fleet, which demonstrated American naval capability and was instrumental in establishing the country as an emerging global power.

The other choices, while significant in the broader context of American history and policy, were not Roosevelt's primary focus upon taking office. While he did champion issues related to civil rights, tax reform, and conservation, his immediate aim to enhance naval strength was a pivotal part of his foreign policy approach and a defining characteristic of his presidency.