Let's be fair; considering how close France & Britain became under the Second Empire, I don't think we can realistically talk about a diplomatic 'gap' between Paris and the other great European capitols due to a Bonaparte sitting on the throne.
True London and Paris did get a lot closer under the Second Empire. Hell at one point in the 1850s there was an official alliance. But you can't deny that by the mid to late 1860s Paris was diplomatically isolated from much of Europe, especially Eastern Europe. France angered Russia with the Crimean war and later supporting the Polish Uprisings in the 60s. France angered Italy, which should have been a major ally considering the role France played in winning its Independence, over the Roman Question. France angered Austria over the Second Italian war and not to mention its Mexican adventure got Emperor Franz Josephs brother killed. France angered Spain and even Britain over its Mexican Empire attempt. And that's not even mentioning all the tension between Paris and Berlin. I'm not saying that this was solely created because Napoleon III was the ruler of France but it definitely contributed to France's isolation.
Last edited: