Wallace Line by the Sahul Shelf to New Guinea. The biogeographic boundary known as Lydekker's Line, which separates the eastern edge of Wallacea from the Australian region, has a similar origin to the Wallace line. During ice age glacial advances, when the , both Asia and Australia were united with what are now islands on their respective continental shelves as continuous land masses, but the deep water between those two large continental shelf areas was, for over 50 million years, a barrier that kept the flora and fauna of Australia separated from those of Asia. Wallacea consists of islands that were not
Henry A. Wallace with theosophist figures undermined his campaign, and were based on the closeness with which he hewed to the Kremlin's Party line and the number of Communist Party members and Party-liners manning the machinery of the campaign. Wallace received 2.4% of the popular vote, and Truman prevailed over Wallace, Republican Thomas E. Dewey, and Dixiecrat Strom Thurmond. After the election, Wallace returned to farming and studied agricultural science. He later published a memoir repudiating his former foreign-policy views and supported the Republican Party nominees in the 1956 and 1960 presidential elections. The Wallace family was of Scots-Irish Presbyterian heritage and had