by Jeff Thomas, International Man:
Empires are built through the creation or acquisition of wealth. The Roman Empire came about through the productivity of its people and its subsequent acquisition of wealth from those that it invaded. The Spanish Empire began with productivity and expanded through the use of its large armada of ships, looting the New World of its gold. The British Empire began through localized productivity and grew through its creation of colonies worldwide—colonies that it exploited, bringing the wealth back to England to make it the wealthiest country in the world.