 For the neo-Russellian, the fundamental explanatory structures consist of microphysically complete dynamical models of the backward lightcone of a given explanandum. While the neo-Russellian view is compatible with the claim that in some non-fundamental domains and for pragmatic reasons information about the ideal explanatory text may fruitfully be presented in causal terms, the view holds that ideal physical explanations are not causal. Causal imperialism turns this picture on its head: for Lewis and others the underlying ideal explanatory structures are causal structures. Hence all explanations are causal in virtue of the fact that they provide information about this structure, even though the information provided in an actual explanation may not be presented in causal terms.