Such a question was that of citizenship, which is regulated by an elaborate annex, adjusted to the complex conditions of citizenship and nationality which had arisen in the Reichsland. The general principle adopted is, broadly speaking, that French nationality is acquired _ipso facto_ by those who had lost it in 1871 and by their descendants, except the offspring of a native mother and a German father who had come to the Reichsland subsequently to the outbreak of the Franco-Prussian war; that it may be claimed before the French authorities by all others save Germans and the descendants of Germans who have come in since 1870; and that such German immigrants and their descendants can acquire French citizenship only by the process of naturalization. The purpose of the whole was to admit on the basis of domicile before 1870, and to exclude, for the present, the Germans, with their descendants, who had come to the Reichsland in large numbers since the German conquest. The economic provisions had to consider not only the status of such individual matters as debts and contracts, pensions and suits at law, but also the new relations created in the region as a whole. Thus France acquired the public property, including the railroads, without any payment, and no share of the German public debt or war indemnity was attached to the transferred territory--arrangements which offset in some measure the principal and interest of the five milliards of war indemnity imposed by Germany in 1871. German economic penetration is restricted not only by the liquidation of existing enterprises but by the right to prohibit new participation in public utilities, mines, quarries, and metallurgical establishments. Important temporary provisions guard against the effects of a sudden interruption of relations between the Left and Right Banks in such matters as ports, terminals, and water power, and in respect to customs tariffs, a period of five years being set during which free exportation is permitted into Germany and free importation of textile materials from Germany into Alsace and Lorraine. This last is particularly important, for the Reichsland enjoyed profitable markets in Germany, and its economic prosperity was constantly urged as an argument for remaining under German rule. Whether or not France can furnish equally good outlets for local manufactures, she must at least provide a reasonable period for readjustment of the lines of trade.