Jewish calendar dating
Since the destruction of the Second Temple in 70 CE, most Jews have lived in diaspora.
Genetic studies on Jews show that most Jews worldwide bear a common genetic heritage which originates in the Middle East, and that they bear their strongest resemblance to the peoples of the Fertile Crescent.
In addition to issues with census methodology, disputes among proponents of halakhic, secular, political, and ancestral identification factors regarding who is a Jew may affect the figure considerably depending on the source.
Israel is the only country where Jews form a majority of the population.
According to the report, about 44% of all Jews reside in Israel (6.3 million), and 40% in the United States (5.7 million), with most of the remainder living in Europe (1.4 million) and Canada (0.4 million).
The exact world Jewish population, however, is difficult to measure.
the experience of diaspora life, from the Ancient Egyptian rule over the Levant, to Assyrian Captivity and Exile, to Babylonian Captivity and Exile, to Seleucid Imperial rule, to the Roman occupation and Exile, and the historical relations between Jews and their homeland thereafter, became a major feature of Jewish history, identity and memory.In this case, it is complicated by long standing politics and religious and cultural prejudices.The prehistory and ethnogenesis of the Jews are closely intertwined with archaeology, biology, and historical textual records, as well as religious literature and mythology.The Cyrus Cylinder, an ancient tablet on which is written a declaration in the name of Cyrus referring to restoration of temples and repatriation of exiled peoples, has often been taken as corroboration of the authenticity of the biblical decrees attributed to Cyrus, Professor Lester L.Grabbe asserted that the "alleged decree of Cyrus" regarding Judah, "cannot be considered authentic", but that there was a "general policy of allowing deportees to return and to re-establish cult sites".