The Civil War itself had given a great stimulus to industry, to the need of providing military equipment and supplies, and of extending, as rapidly as possible, the railroads which were the chief means of transportation. When the war ended in 1865, this expansion went on at an increasing rate. The energy which had been devoted to military purposes was now directed to commerce and industry, to developing the vast unpeopled tracts from the Mississippi to the Pacific, and to exploiting the hitherto neglected or unknown natural resources of the country. Every year science furnished new methods of converting nature's products into man's wealth. Chemistry, the doubtful science, Midas-like, turned into gold every thing that it touched. There were not native workers enough, and so a steady stream of foreign immigrants flocked over from abroad. They came at first to better their own fortunes by sharing in the unlimited American harvests. Later, our Captains of Industry, regardless of the quality of the new comers, and intent only on securing cheap labor to multiply their hoards, combed the lowest political and social levels of southern Europe and of western Asia for employees. The immigrants ceased to look upon America as the Land of Promise, the land where they intended to settle, to make their homes, and to rear their children; it became for them only a huge factory where they earned a living and for which they felt no affection. On the contrary, many of them looked forward to returning to their native country as soon as they had saved up a little competence here. The politicians, equally negligent of the real welfare of the United States, gave to these masses of foreigners quick and unscrutinized naturalization as American citizens.