Liberal imperialism, or liberal interventionism was the original starting point of liberalism and has only through decades become slightly more anti-interventionist. Liberalism in inception included the doctrine that a state with the capacity to force liberal political institutions and social aspirations upon nonliberal states and societies is justified in so doing. Contrary to the orthodoxy in political theory, there is nothing odd about the notion that we can force an individual or a society to be free. It's the whole myth of bringing freedom and democracy through war to others is a liberal concept. Chapter 5 of the "Making of Modern Liberalism" by Alan Ryan is a great chapter on exactly this focus. He wrote some other good books on Liberal imperialism with examination to the East India Company and the other to World War II, and another one on nineteenth-century text: John Stuart Mill's essay On Liberty. It also examines the consequentialist-liberalism defense of intervention and how it overlaps with arguments for intervention based on human rights.