This political scientist and author of democracy in america believed that the delegation of government to the states was one of the strong points of the american system

I think you are trying to find more about Alexis de Tocqueville who wrote a book with the title you have offered. He was a very keen observer of the American political system.

In 1830, he was sent to America by the French government to study the American prison system, but he was far more interested in the wider aspects of American life and politics. He even spent some time in Canada which is to say what is now Ontario and Quebec.

His travelling partner (a man whose family name was Beaumont) wrote a novel about the injustice of Slavery. de Tocqueville shared Beaumont's outrage at the practice.

But his main contribution was his wide vision of America. In general he was a fan and applauded the way the checks and balances worked and the division of power between the Federal and State governments.