The barriers which in previous centuries had made a world unity impossible were ready to crumble when Baha'u'llah appeared, and since His birth, in 1817, and more especially since the promulgation of His teachings began, these barriers have been breaking down in most astonishing fashion.

Be the explanation what it may, about the fact there can be no doubt.
In the days of previous Prophets geographical barriers alone were amply sufficient to prevent world unity.

Now that obstacle has been overcome.
For the first time in human history men on opposite sides of the globe are able to communicate with each other quickly and easily.

Things done in Europe yesterday are known in every continent of the world today, and a speech made in America today may be read in Europe, Asia and Africa tomorrow.
Another great obstacle was the language difficulty.

Thanks to the study and teaching of foreign languages, that difficulty has already been to a large extent overcome; and there is every reason to suppose that ere many years an international auxiliary language will be adopted and taught in all the schools of the world.