Detroit had prospered but little since 1760. Its inhabitants were for the most part easy-going Frenchmen. They were not suited to the strenuous work of city building. Detroit, instead of growing larger, was becoming smaller; and when, in 1820, the United States took a census of the place, it had but 1442 inhabitants as against the 2500 that Major Rogers found in 1760. [Illustration: DETROIT IN 1820, AND STEAMER _WALK-IN-THE-WATER_ (From an old print)] But from 1820 the growth of Detroit has been continuous. In 1825 the Erie Canal was opened, furnishing an easy means of communication from the East to the West. Then came a great tide of immigration to all the states bordering on the Great Lakes. Michigan was one of the first to profit, and Detroit was the gateway to Michigan. Most of the pioneers who sought homes in the West were farmers. The life of cities and villages offered few attractions to them. The number that stayed in Detroit was small as compared to the number that passed through into the back country to clear the woodlands and take up the work of agriculture. But as the back country filled up, there came a demand for the things in which cities deal, while at the same time there came the need of places where the products of the farm could be gathered together ready for transportation to the Eastern market. [Illustration: A DRY DOCK] In this way Detroit began its great growth. It bought the wool and wheat which the Michigan farmers raised, and shipped them East. It bought from the East the dry goods, hardware, and various other things which the Michigan farmers needed, and distributed them. It grew prosperous as the country back of it became more populated, and as this population became richer and able to buy larger amounts and more expensive goods, Detroit reaped the advantage. [Illustration: A PASSENGER STEAMER] Then too the traffic on the lakes became more important, requiring larger and better vessels. Detroit has one of the best harbors on all the Great Lakes, making it splendidly suited for the building and launching of vessels. Always engaged more or less in shipbuilding, Detroit improved its shipyards and kept pace with the demand. To-day it builds all types of vessels, from magnificent passenger steamers to the great steel ore ships which carry the iron ore of the Lake Superior districts. It was in 1860 that Detroit began to take its place among the industrial cities of the country. Now it is fifth among the cities of the United States in the value of its manufactured products. Let us see what its chief industries are. [Illustration: A LAKE VESSEL BUILT IN DETROIT] First of all comes the manufacture of automobiles and the parts of which they are made. It is estimated that more than half of all the automobiles made in the United States are built in Detroit factories. Until 1899 there was not a single automobile factory in the city. To-day there are over thirty, many of them covering acres of ground.