e (the Swiss Council of States, 2 representatives per canton) and a lower house (the National Council of Switzerland, representatives elected from across the country). Referenda were made mandatory for any amendment of this constitution.
A system of single weights and measures was introduced and in 1850 the Swiss franc became the Swiss single currency. Article 11 of the constitution forbade sending troops to serve abroad, though the Swiss were still obliged to serve Francis II of the Two Sicilies with Swiss Guards present at the Siege of Gaeta in 1860, marking the end of foreign service.
An important clause of the constitution was that it could be re-written completely if this was deemed necessary, thus enabling it to evolve as a whole rather than being modified one amendment at a time.
This need soon proved itself when the rise in population and the Industrial Revolution that followed led to calls to modify the constitution accordingly. An early draft was rejected by the population in 1872 but modifications led to its acceptance in 1874. It introduced the facultative referendum for laws at the federal level. It also established federal responsibility for defense, trade, and legal matters.
In 1891, the constitution was revised with unusually strong elements of direct democracy, which remain unique even today.
Modern history
Switzerland was not invaded during either of the world wars. During World War I, Switzerland was home to Vladimir Illych Ulyanov (Vladimir Lenin) and he remained there until 1917. Swiss neutrality was seriously questioned by the Grimm-Hoffmann Affair in 1917, but it was short-lived. In 1920, Switzerland joined the League of Nations, which was based in Geneva, on the condition that it was exempt from any military requirements.
During World War II, detailed invasion plans were drawn up by the Germans, but Switzerland was never attacked. Switzerland was able to remain independent through a
