The factors most immediately and importantly to be credited with all these advances were the improvements in the steam engine, the electric telegraph, and the manufacture of steel; also the invention of the dynamo-electric machine, the electric light and the telephone. These factors had given such power and certainty and speed to the Machine of Civilization that the nations which joined it and became contributory parts of it, advanced rapidly in prosperity and wealth, both actually and also relatively, as compared with nations that did not.

In the year 1900, the great nations of the world were Great Britain, France, Germany, the United States and Japan. Of these Japan had advanced the most in civilization during the preceding half century, then the United States, then Germany, then Great Britain, and then France. The nation that had increased the most in territorial extent was Great Britain. In 1900, the British Empire, including India, covered about one-fourth of the whole surface of the earth. It comprised, besides Great Britain and Ireland, five self-governing colonies, the Dominion of Canada, the Commonwealth of Australia, the Union of South Africa, New Foundland and New Zealand, in addition to the 1,800,000 square miles of British India and her three hundred million people. France had "expanded" in both Africa and Asia; that is, she had conquered territory in those partially civilized continents. Germany had done similarly; and Russia had subjugated the nomadic and semi-nomadic tribes of Central Asia. The United States had taken only a little territory, that included in the Philippines and Porto Rico; for she had expanded her constructive energy and skill in developing the vast and fertile area within her own boundaries. Japan had expanded only slightly in actual territory; the exercise of her constructive talents being urgently required at home.

It may be declared that invention should not be credited with any of this expansion, for the reasons that to increase one's possessions is an instinct of human nature, and that the colonization of savage and barbarous lands has been a favorite activity with great nations always. True: but the inventions enumerated in this book, and the agencies which they supplied for going quickly, surely and safely to places far away; of taking to those places certain tools of conquest, such as guns and powder; and of supplying afterward to the conquered people finer conveniences of living, juster laws and better government of every kind, have been the effective means to an end that could not have been attained without them.

It may be objected that the principal factors in all of these achievements have been omitted, the commercial enterprise of the merchants, the farseeing wisdom of the statesmen, the valor and skill of the strategists, and (back of all) the courage and enterprise of the original explorers. That these have been omitted, is true; for the reason that this discussion is intended to point out only what invention has done. It is obvious that the main incentive of colonization has been commercial gain, and that the initiators of colonization schemes have usually been merchants. It is equally obvious that the statesmen are to be credited with the framing and execution of the measures needed to make any colonization scheme effective; and it is equally obvious that strategists and explorers did work without which no expansion whatever would have been possible. Nevertheless, it must be clear that the essential difference between the conquerors and the conquered, by reason of which the uncivilized were conquered by the civilized, lay in the aids which civilization had supplied to the civilized. Colonization and conquest have been going on ever since the beginning of recorded history and before; but from the days of Thutmose III in ancient Egypt until now, the conqueror and the colonizer have in almost every case been more civilized than were their victims. It is true also that savages have sometimes overrun civilized countries, and even conquered them, for Alaric captured even Rome: but up to the present time, the fruits of such conquests have not been permanent, whereas the fruits of colonization have been.

In 1900, then, the Machine of Civilization was in operation in all parts of the world; in the dark continent of Africa, the deserts of Asia, the wild regions of Australia, and even on the ocean. In fact, it was on the ocean that the Machine was operating with the most efficiency and effectiveness; for nowhere else are the power and the harmony of machinery of all kinds, inert and human, seen in such perfection as in great steamships on the sea.

We seem safe in concluding, therefore, that while invention was only one of many factors in bringing about the world-wide conditions that prevailed in 1900, invention was the initiating factor. It was invention that suggested to the explorer that he explore; to the merchant that he launch his enterprise; to the statesman that he encourage the merchant and assist him with wise laws; to the strategist that he make such and such plans, to meet the emergencies that arose. Finally, it was invention that made possible the actual transportation of explorers and merchants and troops to designated spots, and made successful the operations which ensued there.

But the Machine still continued growing. In 1900 Hewitt invented his beautiful mercury-vapor electric light, and in 1901 Santos-Dumont invented his air-ship and demonstrated its practicability by going around the Eiffel Tower in Paris in it and returning to the spot from which he started. This feat began that great succession of feats with dirigible balloons with which we are so familiar now, and which promise to be succeeded by a condition of world-wide transportation through the air.

In 1900, the author of this book patented the method of controlling the movements of vessels, which consists in using radio telegraphy. This invention has recently been brought to the stage of practicality by the United States Navy. It was utilized in July, 1921, for steering the Iowa when bombed by airplanes.

In 1903 came the first successful flight by aeroplane, which was made by the brothers Orville and Wilbur Wright at Kitty Hawk, North Carolina. This was an epochal adventure; it inaugurated an age which is already called the Aerial Age, and which will bring about changes so vast that our imagination cannot picture them.

An interesting and instructive fact connected with this flight, and with the aeroplane in general, is that the aeroplane was not practicable and could not be made practicable before the internal-combustion engine had been invented and developed; because all preceding engines had been too heavy. This illustrates the fact occasionally adverted to in this book, that one of the most important factors in the influence of invention is that each new invention facilitates later inventions. The influence of invention is cumulative.