The decade of the 1990s witnessed enormous changes in the international environment. The Cold War conclusively ended. Biotechnology and communications technology made rapid advances. Barriers to international trade and investment declined. Taken together, these developments created many opportunities for peace and prosperity. At the same time, with the end of superpower domination, ethnically based intranational conflicts brought on widespread suffering. And while globalization expanded opportunity, growth, and incomes, it increased inequality of incomes and decreased human security. Moreover, as countries have become more closely linked, insecurity in one country has affected security in other countries.