The movement was checked, but not stopped. In 1847 ominous signs of a popular revolution moved King Frederick William IV of Prussia to summon the Diet to consider governmental reforms. The chief demand presented by this Diet was for a popular representation in the government. The King refused to grant this. A striking commentary upon the political backwardness of Germany is furnished by the fact that one of the demands made by a popular convention held in Mannheim in the following year was for trial by jury, a right granted in England more than six hundred years earlier by the Magna Charta. Other demands were for the freedom of the press and popular representation in the government. The revolution of 1848 in Prussia, while it failed to produce all that had been hoped for by those responsible for it, nevertheless resulted in what were for those times far-reaching reforms. A diet was convoked at Frankfort-on-the-Main. It adopted a constitution establishing some decided democratic reforms and knit the fabric of the German confederation more closely together. The structure of the Confederation was already very substantial, despite much state particularism and internal friction. An important event in the direction of a united Germany had been the establishment in 1833 of the _Zollverein_ or Customs Union. The existence of scores of small states,[1] each with its own tariffs, currency and posts, had long hindered economic development. There is a well-known anecdote regarding a traveler who, believing himself near the end of his day's journey, after having passed a dozen customs-frontiers, found his way barred by the customs-officials of another tiny principality. Angered at the unexpected delay, he refused to submit to another examination of his effects and another exaction of customs-duties. [1] There were more than three hundred territorial sovereignties in Germany when the new constitution of the union was adopted at the Congress of Vienna in 1815.--There were principalities of less than one square mile in extent. The particularism engendered by this state of affairs has always been one of the greatest handicaps with which federal government in Germany has had to contend. "You aren't a country," he said. "You're just a spot. I'll go around you." And this he did, without being seriously delayed in reaching his destination. The growing power of Germany aroused the fear of the French, who realized what the union of the vital, energetic and industrious German races would mean. Years of tension culminated in the war of 1870-71. The result is known. Unprepared for the conflict, the French were crushed, just as Austria had been crushed four years earlier. The last external obstacle in the way of German unity and strength had thus strangely been removed. On January 18, 1871, while the victorious German armies still stood at the gates of Paris, King William I was proclaimed German Emperor as Kaiser Wilhelm I.