Those errors. as in all statistical work. counterbalance one another. and the statisticians are very confident. and have told us so. that the margin of error in their calculation in that group is infinitesimal. That brings us. then. to the fourth group. about which so much controversy has ragedwhat is called the colonial group. It is a surprising thing to know how little immigration we got Into this continent hi the first three centuries after Columbus came. I have been toldi that less than 80.000 immigrants came here in all the centuries down to 1750. It is criticized that perhaps a German came on a British ship. It is not enough to know the nationality of the ships that came. but when we think back to it and remember how few persons came on any one ship. and how those voyages were organized in a sense as local enterprises. we can be reasonably sure that there. too. any possible errors have pretty well balanced themselves in the calculation of the origin of those people.
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