John Boyd Orr said this quote

As we have seen, the wireless and the airplane have made the world so small and nations so dependent on each other that the only alternative to war is the United States of the World.

~ John Boyd Orr

Measured in time of transport and communication, the whole round globe is now smaller than a small European country was a hundred years ago.

~ John Boyd Orr

Our civilization is now in the transition stage between the age of warring empires and a new age of world unity and peace.

~ John Boyd Orr

Some wars have been due to the lust of rulers for power and glory, or to revenge to wipe out the humiliation of a former defeat.

~ John Boyd Orr