Final answer:
The Mexican-American War was a conflict between the United States and Mexico that had lasting effects on foreign relations and the slavery debate.
Step-by-step explanation:
The Mexican-American War was a conflict between the United States and Mexico that took place from 1846 to 1848. The war was a result of tensions over the annexation of Texas by the United States and a boundary dispute between the two countries.
Several factors impacted the war's outcome and influenced its lasting effects. The United States military gained experience and prestige, while the war's cost in terms of American lives and money was high.
Furthermore, the war negatively affected foreign relations in Latin America, particularly with Mexico. It intensified anti-American sentiments and contributed to distrust and suspicion of the United States in the region. The war also reignited the debate over slavery and upset the balance established by the Missouri Compromise.