In other words, when groups competed for resources, the ones with a larger or more effective central governments always won out. Always.
That's because a central government is also a monopoly on resources, labor, and defense. Just as it's difficult for smaller companies to compete against established monopolies, so it is difficult for smaller, locally managed groups of people to compete against those who would claim the whole world as their kingdom if they had the armies to maintain it.
Furthermore, the largest and most successful nations/organizations in history were marked by highly effective, pervasive and very large central governments.
As were some of history's greatest failures. The bigger they are, the harder they fall.