Beginning at 1900, this unparalleled review of the twentieth century documents, contrasts and relates two planetary processes. It highlights the historical upheavals, agonies and progress of human collectivity, and it follows the gradual emergence from obscurity of the Baha'i World Community, demonstrating on a global scale the unifying power with which its Divine origin has endowed it. Prepared under the supervision of the Universal House of Justice, there is no more timely review of our past, and its present implications.