Which circumstance did not contribute to the war with Spain?

The signing of the Roosevelt Corollary is the correct choice as the circumstance that did not contribute to the war with Spain. The Roosevelt Corollary, established in 1904, was an extension of the Monroe Doctrine and mainly addressed U.S. intervention in Latin America and the Caribbean. Its focus was on maintaining order in these regions rather than involvement in conflicts such as the Spanish-American War, which began in 1898 due to other pressing issues.

In contrast, American expansionism was a significant factor leading to the war, as the U.S. sought to expand its influence and territories. The rebellion in the Spanish Philippines was another critical issue, as it demonstrated the struggles against Spanish colonial rule that were emblematic of the broader conflict involving Spain's declining empire. The sinking of the USS Maine acted as the immediate catalyst for the war, with public outrage fueling support for military action against Spain. Collectively, these elements are directly tied to the motivations and events surrounding the outbreak of the conflict, while the Roosevelt Corollary is more related to U.S. policy in a different context and time frame.