Why did Abraham Lincoln veto laws?

Abraham Lincoln vetoed laws primarily to uphold his constitutional interpretation and protect the Union during the Civil War. He believed that some legislation, such as the Wade-Davis Bill, was too punitive toward the Southern states and would undermine efforts for reconciliation. Additionally, Lincoln often used his veto power to assert executive authority and ensure that laws aligned with his vision for the nation’s future. His vetoes reflected his commitment to preserving the Union and promoting gradual emancipation.