Political, economic, and cultural structures of varying form, often grouped under the headings of empires and imperialism, have reflected global ambitions. Struggles for autonomy have occurred at the frontiers of these empires, at their dissolution, and in many other sites both within and outside imperial structures. Central to many of these struggles are those over the introduction of Western notions of property rights. Property rights often involve the establishment of private control over land, goods, living organisms, and technologies. As such, they give rise to some of the most intensive struggles at the heart of the tension between globalization and autonomy.