Lincoln spoke against Mexican–American War

Abraham Lincoln's opposition to the Mexican-American War is a notable aspect of his early political career. He criticized President James K. Polk's motivations for engaging in the conflict, suggesting that Polk had ulterior motives to distract the public from his actions by promoting the allure of military glory. Lincoln's remarks highlighted his belief that the war was not justified and that it served to further entrench the institution of slavery in the United States. He articulated his concerns in a series of speeches, where he questioned the legitimacy of the war and its implications for the nation. Lincoln's stance was particularly significant as it aligned with the sentiments of many who viewed the war as an expansionist endeavor that would exacerbate the issue of slavery in newly acquired territories. In addition to his vocal opposition, Lincoln supported the Wilmot Proviso, which aimed to prohibit slavery in any territory acquired from Mexico. Although the proposal ultimately failed, it underscored the growing tensions between pro-slavery and anti-slavery factions in the U.S. The Mexican-American War and the debates surrounding it played a crucial role in shaping the political landscape of the time, contributing to the emergence of the Republican Party and setting the stage for future conflicts over slavery. Lincoln's early opposition to the war and his advocacy for the Wilmot Proviso positioned him as a key figure in the anti-slavery movement, influencing his later policies and actions as President during the Civil War.