Whatever may be the truth as to this, there can be no doubt as to the annoyance felt by Roman Catholic Bavaria and Protestant democratic Würtemberg at accepting the supremacy of the Prussian bureaucracy. This doubtless explains why Bismarck was so anxious to hurry through the negotiations, first, for the imperial union, and thereafter for the conclusion of peace with France. Even in a seemingly small matter he had met with much opposition, this time from his master. The aged monarch clung to the title King of Prussia; but if the title of Emperor was a political necessity, he preferred the title "Emperor of Germany"; nevertheless, the Chancellor tactfully but firmly pointed out that this would imply a kind of feudal over-lordship of all German lands, and that the title "German Emperor", as that of chief of the nation, was far preferable. In the end the King yielded, but he retained a sore feeling against his trusted servant for some time on this matter. It seems that at one time he even thought of abdicating in favour of his son rather than "see the Prussian title supplanted[73]." However, he soon showed his gratitude for the immense services rendered by Bismarck to the Fatherland. On his next birthday (March 22) he raised the Chancellor to the rank of Prince and appointed him Chancellor of the Empire. [Footnote 73: E. Marcks, _Kaiser Wilhelm I._ (Leipzig, 1900), pp. 337-343.] It will be well to give here an outline of the Imperial Constitution. In all essentials it was an extension, with few changes, of the North German federal compact of the year 1866. It applied to the twenty-five States of Germany--inclusive, that is, of Hamburg, Bremen, and Lubeck, but exclusive, for the present, of Elsass-Lothringen (Alsace-Lorraine). In those areas imperial law takes precedence of local law (save in a few specially reserved cases for Bavaria and the Free Cities). The same laws of citizenship hold good in all parts of the Empire. The Empire controls these laws, the issuing of passports, surveillance of foreigners and of manufactures, likewise matters relating to emigration and colonisation. Commerce, customs dues, weights and measures, coinage, banking regulations, patents, the consular service abroad, and matters relating to navigation also fall under its control. Railways, posts and telegraphs (with the exceptions noted above) are subject to imperial supervision, the importance of which during the war had been so abundantly manifested.