“The description of the Habsburg defensive barrier against the Ottoman Empire, as well as a section comparing and contrasting the Ottoman and Iberian empires, are innovative as well as informative; most researchers limit their focus to the English and sometimes the French empires. The fact that this is an open-access book electronically makes it an even more valuable addition to the literature.” (Robin Grier, The Journal of Interdisciplinary History, Vol. 51 (1), 2020)“The book provides an excellent graduate-level survey. … Graduate students and scholars rewriting their lecture courses will profit from perusing this ambitious volume.” (Stuart M. McManus, Hispanic American Historical Review, Vol. 100 (3), 2020)