What impact did the annexation of Texas have on U.S. foreign policy?

The annexation of Texas significantly impacted U.S. foreign policy, particularly in relation to diminishing British influence in North America. After Texas gained independence from Mexico and subsequently sought to join the United States, there were concerns that Britain might establish a foothold in Texas to counter U.S. expansion. By annexing Texas, the United States effectively curtailed any potential British ambitions in the region, thereby reinforcing its own geopolitical stance and influence in the Americas.

This move also influenced the dynamics of U.S.-Mexico relations, as it contributed to tensions that would eventually lead to the Mexican-American War. The annexation aligned with the broader doctrine of Manifest Destiny, which held that American expansion across the continent was both justified and inevitable. This doctrine not only shaped internal policies but also set the stage for how the U.S. would interact with foreign nations regarding territorial expansion and influence.

Overall, the annexation aligned U.S. interests more closely with expansionist goals and reduced the likelihood of foreign powers, like Britain, asserting influence in territories to the south.