Baha’u’llah “envisaged … the establishment of a "world commonwealth"

The unity of the human race, as envisaged by Bahá'u'lláh, implies the establishment of a world commonwealth in which all nations, races, creeds and classes are closely and permanently united, and in which the autonomy of its state members and the personal freedom and initiative of the individuals that compose them are definitely and completely safeguarded. This commonwealth must, as far as we can visualize it, consist of a world legislature, whose members will, as the trustees of the whole of mankind, ultimately control the entire resources of all the component nations, and will enact such laws as shall be required to regulate the life, satisfy the needs and adjust the relationships of all races and peoples. A world executive, backed by an international Force, will carry out the decisions arrived at, and apply the laws enacted by, this world legislature, and will safeguard the organic unity of the whole commonwealth. A world tribunal will adjudicate and deliver its compulsory and final verdict in all and any disputes that may arise between the various elements constituting this universal system. A mechanism of world inter-communication will be devised, embracing the whole planet, freed from national hindrances and restrictions, and functioning with marvellous swiftness and perfect regularity. A world metropolis will act as the nerve centre of a world civilization, the focus towards which the unifying forces of life will converge and from which its energizing influences will radiate. A world language will either be invented or chosen from among the existing languages and will be taught in the schools of all the federated nations as an auxiliary to their mother tongue. A world script, a world literature, a uniform and universal system of currency, of weights and measures, will simplify and facilitate intercourse and understanding among the nations and races of mankind. In such a world society, science and religion, the two most potent forces in human life, will be reconciled, will co-operate, and will harmoniously develop. The press will, under such a system, while giving full scope to the expression of the diversified views and convictions of mankind, cease to be mischievously manipulated by vested interests, whether private or public, and will be liberated from the influence of contending governments and peoples. The economic resources of the world will be organized, its sources of raw materials will be tapped and fully utilized, its markets will be co-ordinated and developed, and the distribution of its products will be equitably regulated.

God’s Teachings that are brought to us by His Manifestations (Prophets) are intended for the whole humanity

The summons and the message which We gave were never intended to reach or to benefit one land or one people only. Mankind in its entirety must firmly adhere to whatsoever hath been revealed and vouchsafed unto it. (Baha'u'llah, Gleanings from the Writings of Baha'u'llah)

God has “endowed every soul with the capacity to recognize the signs of God”

He[God] hath endowed every soul with the capacity to recognize the signs of God. How could He, otherwise, have fulfilled His testimony unto men, if ye be of them that ponder His Cause in their hearts. He will never deal unjustly with any one, neither will He task a soul beyond its power. He, verily, is the Compassionate, the All-Merciful. (Baha'u'llah, Gleanings from the Writings of Baha'u'llah)