Please define what kind of Liberals you are talking about, since this is the most dominant and important ideology practiced and implemented in many countries in the Western world and therefore there also are many strains/variants available of it.
- Modern/Social Liberals
- Classic Liberals
- Keynesian Liberals
- Economic Liberals
- Anarcho-capitalist Liberals / Libertarians
Roosevelt and his New Deal would be either Keynesian or Modern/Social Liberalism.
I suspect you are talking about the last version "Libertarians", but this is just theoretical shit liberalism in my mind as I stand for the first on the list.
If you need more details on this huge subject please check https://en.wikipedia.org/wiki/Liberalism