Final answer:
a. Polk's declaration of war was heavily influenced by external events beyond his control, such as Mexico's refusal to recognize the annexation of Texas and the skirmish that occurred in the disputed territory. While Polk made the ultimate decision, these external factors greatly shaped his actions.
Step-by-step explanation:
a. Polk's declaration of war was heavily influenced by external events beyond his control. Polk seized an opportunity to provoke war with Mexico when he ordered General Zachary Taylor into disputed territory, which led to a skirmish that Polk used as a justification for declaring war. Despite opposition from some Whigs, Congress overwhelmingly approved the declaration of war.
Furthermore, Mexico's refusal to recognize the annexation of Texas and its rejection of diplomatic ties with the United States played a significant role in driving Polk's declaration of war. The Mexican government's actions and attitude towards the United States increased tensions and made war seem almost inevitable.
Overall, while Polk's decision-making played a role in the declaration of war, the external events and circumstances heavily influenced his decision to go to war with Mexico.