In the Introduction to a previous volume,[1] it was pointed out that all the British possessions in the New World have one common feature; viz. that they have been, in the main, fields of European settlement, and not merely trading stations or conquered dependencies; but that, in other respects--in climate, in geography, and in what may be called the strata of colonization--the West Indian and North American provinces of the Empire stand at opposite poles to each other. It may be added that, in North America, European colonization was later in time and slower in development than {2} in the central and southern parts of the continent; and, in order to understand why this was the case, some reference must be made to the geography of North America, more especially in its relation to Europe, and also to its first explorers, their motives, and their methods. [Footnote 1: Vol. ii, _West Indies_, pp. 3, 4.] [Sidenote: _Geographical outline of America._] The Old World lies west and east. In the New World the line of length is from north to south. The geographical outline of America, as compared with that of Europe and Asia, is very simple. There is a long stretch of continent, with a continuous backbone of mountains, running from the far north to the far south. The mountains line the western coast; on the eastern side are great plains, great rivers, broken shores, and islands. Midway in the line of length, where the Gulf of Mexico runs into the land, and where, further south, the Isthmus of Darien holds together North and South America by a narrow link, the semicircle of West Indian islands stand out as stepping-stones in the ocean for wayfarers from the old continent to the new. [Sidenote: _North and South America._] The two divisions of the American continent are curiously alike. They have each two great river-basins on the eastern side. The basin of the St. Lawrence is roughly parallel to that of the Amazon; the basin of the Mississippi to that of La Plata. The North American coast, however, between the mouth of the St. Lawrence and that of the Mississippi, is more varied and broken, more easy of access, than the South American shores between the Amazon and La Plata. On the other hand, South America has an attractive and accessible northern coast, in strong contrast to the icebound Arctic regions; and the Gulf of Venezuela, the delta of the Orinoco, and the rivers of Guiana, have called in traders and settlers from beyond the seas. [Sidenote: _South America colonized from both sides, North America only from the eastern side._]