Anthropologists have found homo sapiens skeletons in many places going back thousands of years—well over 100,000 years—in many places. These are surely inconsistent a Young Earth history, and particularly with a view in which Adam was created in the fifth millennium B.C., or even a few millennia before that. Considering that, it is probable given the extra-Biblical evidence that mankind has been roaming earth for tens of thousands of years. You might say that even if that were true, mankind might have been wiped out in the Flood and then the Table of Nations would still be accurate as a snapshot circa 2500 B.C. of the nations centered around Israel. The problem with that response is that we have evidence that the ancestors of today’s Australians are ancient pre-Flood Australians, and the ancestors of today’s Europeans are ancient pre-Flood Europeans, and so forth. Moreover, it does not seem likely that the Flood, if it lived on in global memory from ancient times, could have lived on in that way for literally many thousands, let alone tens of thousands, of years. If the Flood of the Bible, it would have had to have happened roughly when it was supposed to have happened—sometime between 4000 and 2000 BC, say (Henry puts it at 2349 B.C.). So this is one question on which I am afraid that in all honesty I have no good answer. I simply do not see how the Table of Nations is plausible, at least when combined with a worldwide flood.