You mentioned "economic internationalism" in your last post, but that's not what neoconservatism is. It's more than just internationalism (as even the Founders advocated peaceful trade with all); it's interventionism. The interventionist itch in Washington didn't really get going until the 1890's, dropped off around 1910, got revived by Wilson in WWI, and then lay dormant until FDR's policies in the late 1930's. Neoconservatism is the extent to which conservatives participated in these deveolpments, which prior to WWII, was confined mostly to the McKinley/Roosevelt presidencies (or even just McKinley, if, as you've said, Roosevelt wasn't really all that conservative).