The States of Europe, excepting Russia, were already a settled, established and balanced system. They were living in final and conclusive boundaries with no further possibility of peaceful expansion. Every extension of a European state involved a war; it was only possible through war. And while the limits to the United States have been set by the steamship and the railroad, the limits to the European sovereign states were drawn at a much earlier time. They were drawn by the horse, and particularly the coach-horse travelling along the high road. If you will examine a series of political maps of Europe for the last two thousand years, you will see that there has evidently been a definite limit to the size of sovereign states through all that time, due to the impossibility of keeping them together because of the difficulty of intercommunication if they grew bigger. And this was in spite of the fact that there were two great unifying ideas present in men's minds in Europe throughout that period, namely, the unifying idea of the Roman Empire, and the unifying idea of Christendom. Both these ideas tended to make Europe one, but the difficulties of communication defeated that tendency. It is quite interesting to watch the adventures of what is called first the Roman Empire and afterwards the Holy Roman Empire, in a series of historical maps. It keeps expanding and then dropping to pieces again. It is like the efforts of someone who is trying to pack up a parcel which is much too big, in wet blotting paper. The cohesion was inadequate. And so it was that the eighteenth century found Europe still divided up into what I may perhaps call these high-road and coach-horse states, each with a highly developed foreign policy, each with an intense sense of national difference and each with intense traditional antagonisms. Then came this revolution in the means of locomotion, which has increased the normal range of human activity at least ten times. The effect of that in America was opportunity; the effect of it in Europe was congestion. It is as if some rather careless worker of miracles had decided suddenly to make giants of a score of ordinary men, and chose the moment for the miracle when they were all with one exception strap-hanging in a street car. The United States was that fortunate exception. Now this is what modern civilization has come up against, and it is the essential riddle of the modern sphinx which must be solved if we are to live. All the European boundaries of to-day are impossibly small for modern conditions. And they are sustained by an intensity of ancient tradition and patriotic passion.... That is where we stand.