Whilst we are on the subject of population.
Here are the figures for the Jewish population in the time period we are discussing. If you look at the figures you will see that no Jews have gone missing, so there are no 'millions' in transit.
" The Census of Jews Worldwide Figures:
Here are some census figures of Jews living Worldwide to consider:
World Almanac, 1925, pg. 752 — 15,630,000, “In 1925 a census of Palestine gave a total of 115,151 Jews”
World Almanac, 1929, pg. 727 — 15,630,000
National Council of Churches 1930 — 15,600 ,000
March 24, 1933, jewish newspaper Daily Express — 14,000,000 jews worldwide
World Almanac, 1933, pg. 419 — 15,316,359, [“The estimate for Jews in the above table is for 1933, and is by the American Jewish Committee”
World Almanac, 1936, pg. 748 — world jewish population = 15,753,633
World Almanac, 1938, pg. 510 — world jewish population = 15,748,091, with 240,000 in Germany
American Jewish Committee Bureau of the Synagogue Council, 1939 — 15,600,000
World Almanac, 1940, pg. 129: World Jewish Population — 15,319,359
World Almanac, 1941, pg. 510: World Jewish Population — 15,748,091
World Almanac, 1942, pg. 849 — 15,192,089, “Jews include Jews by race not necessarily by religion”
World Almanac USA, 1947, pg. 748: World Jewish Population — 15,690,000
World Almanac, 1949, pg. 289: World Jewish Population — 15,713,638
Statistical Handbook of Council of Churches USA 1951 — 15,300,000
World Almanac, US News & World Report, 1983 population of jews — 16,820,850
World Almanac, 1996, pg. 646: World Jewish Population — 14,117,000
World Almanac & Book of Facts, 1989: World Jewish Population –18,080,000
World Almanac & Book of Facts, 2001: World Jewish Population — 13,200,000"