At Cooper Union, Abraham Lincoln delivered a speech that would become a defining moment in his political ascent. Scheduled for February 27, 1860, this event brought together a diverse audience, including influential politicians, scholars, and citizens concerned about the future direction of the United States amidst rising tensions over slavery. Lincoln's remarks were centered on the preservation of the Union, opposing the extension of slavery into the territories, and challenging the views held by his political opponents at the time.

Lincoln's choice of location was strategic; New York was a hub of political activity and had increasing importance in national elections. The Cooper Institute itself was a prominent venue known for hosting discussions on pressing societal issues. During his speech, Lincoln effectively used historical references, particularly the Founding Fathers, to bolster his arguments, thus appealing to the American values of liberty and equality. His logical framework and moral stance resonated deeply with the audience, with many reflecting on the clarity and strength of his convictions.

The aftermath of the Cooper Union speech was immediate and profound. Within weeks, Lincoln gained national recognition, and his campaign team leveraged the momentum, positioning him as a formidable candidate for the Republican nomination. The speech helped establish him as a leader who could articulate the concerns of the Northern states, ultimately leading to his election as President later that year. The event marked a crucial turning point in Lincoln's political career, elevating him from a relatively unknown figure to a prominent national leader.