In the United States, minority populations were never an indigestible mass—with the major exceptions of the one ethnic group that did not come here voluntarily (African Americans) and those who were here when Europeans arrived (American Indians). The rest all came, clustered and dispersed, and added new cultural layers to the general society. This has always been the strength of the United States. In much of Europe, for example, Muslims have retained religious and national identities distinct from the general population, and the general population has given them little encouragement to blend. The strength of their own culture has therefore been overwhelming.

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Old institutions have shattered, but new ones have not yet emerged. The twenty-first century will be a period in which a range of new institutions, moral systems, and practices will begin their first tentative emergence. The first half of the twenty-first century will be marked by intense social conflict globally. All of this frames the international struggles of the twenty-first century.

No continent is as small and fragmented as Europe. Only Australia is smaller, yet Europe consists of fifty independent nations (including Turkey and the Caucasus, for reasons explained later). Crowded with nations, it is also crowded with people. Europe's population density is 72.5 people per square kilometer. The European Union's density is 112 people per square kilometer. Asia has 86 people per square kilometer. Europe is crowded and fragmented.

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The problem for China is political. China is held together by money, not ideology. When there is an economic downturn and the money stops rolling in, not only will the banking system spasm, but the entire fabric of Chinese society will shudder. Loyalty in China is either bought or coerced. Without available money, only coercion remains. Business slowdowns can generally lead to instability because they lead to business failure and unemployment. In a country where poverty is endemic and unemployment widespread, the added pressure of an economic downturn will result in political instability.

Mexico will emerge as a major global economic power. Ranked fourteenth or fifteenth early in the century, it will be firmly within the top ten by 2080. With a population of 100 million, it will be a power to be reckoned with anywhere in the world—except on the southern border of the United States.