A maritime people, engrossed chiefly with the idea of trade, moves in small groups and intermittently; hence it modifies the original coastal population less than does a genuine colonizing nation, especially as it prefers the smallest possible territorial base for its operations.  The Arab element in the coast population of East Africa is strongly represented, but not so strongly as one might expect after a thousand years of intercourse, because it was scattered in detached seaboard points, only a few of which were really stable.  The native population of Zanzibar and Pemba and the fringe of coast tribes on the mainland opposite are clearly tinged with Arab blood.  These Swahili, as they are called, are a highly mixed race, as their negro element has been derived not only from the local coast peoples, but also from the slaves who for centuries have been halting here on their seaward journey from the interior of Africa.[496] [See map page 105.]

[Sidenote:  Multiplicity of race elements on coasts.]

Coast peoples tend to show something more than the hybridism resulting from the mingling of two stocks.  So soon as the art of navigation developed beyond its initial phase of mere coastwise travel, and began to strike out across the deep, all coast peoples bordered upon each other, and the sea became a common waste boundary between.  Unlike a land boundary, which is in general accessible from only two sides and tends to show, therefore, only two constituent elements in its border population, a sea boundary is accessible from many directions with almost equal ease; it therefore draws from many lands, and gives its population a variety of ethnic elements and a cosmopolitan stamp.  This, however, is most marked in great seaports, but from them it penetrates into the surrounding country.  The whole southern and eastern coast population of England, from Cornwall to the Wash, received during Elizabeth’s reign valuable accessions of industrious Flemings and Huguenots, refugees from Catholic persecution in the Netherlands and France.[497] Our North Atlantic States, whose population is more than half (50.9 per cent.) made up of aliens and natives born of foreign parents,[498] have drawn these elements from almost the whole circle of Atlantic shores, from Norway to Argentine and from Argentine to Newfoundland.  Even the Southern States, so long unattractive to immigrants on account of the low status of labor, show a fringe of various foreign elements along the Gulf coast, the deeper tint of which on the census maps fades off rapidly toward the interior.  The same phenomenon appears with Asiatic and Australian elements in our Pacific seaboard states.[499] The cosmopolitan population of New York, with its “Chinatown,” its “Little Italy,” its Russian and Hungarian quarters, has its counterpart in the mixed population of Mascat, peopled by Hindu, Arabs, Persians, Kurds, Afghans, and Baluchis, settled here for purposes of trade; or in the equally mongrel inhabitants of Aden and Zanzibar, of Marseilles, Constantinople, Alexandria, Port Said, and other Mediterranean ports.