In what ways were Rockefeller and Carnegie similar?

John D. Rockefeller and Andrew Carnegie were both titans of American industry during the late 19th century, known for their pivotal roles in the oil and steel industries, respectively. They both utilized innovative business practices and strategies that led to the creation of monopolies, significantly shaping the economy of their time. Additionally, both men engaged in extensive philanthropy later in life, donating vast sums to educational, cultural, and scientific causes, reflecting their belief in the responsibility of the wealthy to contribute to society.