Instead of concentrating on the internal consequences of the institution of a state, however, I will focus on its external consequences, i.e., foreign rather than domestic policy.
For one, as an agency that perverts justice and imposes taxes, every state is threatened with “exit.” Especially its most productive citizen may leave to escape taxation and the perversions of law. No state likes this. To the contrary, instead of seeing the range of control and tax base shrink, state agents prefer that they be expanded. Yet this brings them in conflict with other states. Unlike competition between “natural” persons and institutions, however, the competition between states is eliminative. That is, there can be only one monopolist of ultimate decision-making and taxation in any given area. Consequently, the competition between different states promotes a tendency toward political centralization and ultimately one single world state.
Further, as tax-funded monopolists of ultimate decision-making, states are inherently aggressive institutions. Whereas “natural” persons and institutions must bear the cost of aggressive behavior themselves (which may well induce them to abstain from such conduct), states can externalize this cost onto their taxpayers. Hence, state agents are prone to become provocateurs and aggressors and the process of centralization can be expected to proceed by means of violent clashes, i.e., interstate wars.
Moreover, given that states must begin small and assuming as the starting point a world composed of a multitude of independent territorial units, something rather specific about the requirement of success can be stated. Victory or defeat in interstate warfare depend on many factors, of course, but other things such as population size being the same, in the long run the decisive factor is the relative amount of economic resources at a state’s disposal. In taxing and regulating, states do not contribute to the creation of economic wealth. Instead, they parasitically draw on existing wealth. However, state governments can influence the amount of existing wealth negatively. Other things being equal, the lower the tax and regulation burden imposed on the domestic economy, the larger the population will tend to grow and the larger the amount of domestically produced wealth on which the state can draw in its conflicts with neighboring competitors. That is, states which tax and regulate their economies comparatively little — liberal states — tend to defeat and expand their territories or their range of hegemonic control at the expense of less-liberal ones.
This explains, for instance, why Western Europe came to dominate the rest of the world rather than the other way around. More specifically, it explains why it was first the Dutch, then the British and finally, in the 20th century, the United States, that became the dominant imperial power, and why the United States, internally one of the most liberal states, has conducted the most aggressive foreign policy, while the former Soviet Union, for instance, with its entirely illiberal (repressive) domestic policies has engaged in a comparatively peaceful and cautious foreign policy. The United States knew that it could militarily beat any other state; hence, it has been aggressive. In contrast, the Soviet Union knew that it was bound to lose a military confrontation with any state of substantial size unless it could win within a few days or weeks.
The Paradox of Imperialism by Hans Hermann Hoppe
To answer your question, “Europe” did not conquer the world. Instead Europe produced capitalist enterprise, and states that leveraged the benefits of capitalism were able to wipe out the others, in Europe and, eventually, the rest of the world. It was because of limited freedom and capitalism that the Italians could become sea-explorers. It was because the Spanish kings could buy ocean-going ships that they could send their Italian agents to conquer America. Had this capital not been available, they would have remained trapped in Spain.
Later it was the Spanish fiefdom of the Netherlands that decided to become more liberal by getting rid of feudalism, and the Dutch spread this sea-faring, capitalistic technology to even farther ends of the Earth. The Dutch became wealthy and powerful enough to conquer Britain, which then took on the task of developing global capitalism. And of course the United States came out of the British Empire to conquer the entire world.
What this has to do with “Europeans” is tenuous. European tribes, with their capitalistic technology, could easily wipe out inferior tribes and settle primitive countries, enslaving the locals. This is what happened in South Africa with the Boers, but as “Europeans” they did not enjoy any special rights, eventually the British came to enslave and destroy them as well.