Migration Matrix (IMAGE) Brown University Caption Today's populations on the Eurasian land mass consists almost entirely of indigenous populations, while the Americas and Australia are predominantly populated by descendants of immigrants. Credit Putterman and Weil Usage Restrictions None License Licensed content Disclaimer: AAAS and EurekAlert! are not responsible for the accuracy of news releases posted to EurekAlert! by contributing institutions or for the use of any information through the EurekAlert system.