Switzerland was not invaded during either of the World Wars. During World War I, Switzerland was home to Vladimir Lenin and he remained there until 1917[5] In 1920, Switzerland joined the League of Nations, and in 1963 the Council of Europe.
During World War II, detailed invasion plans were drawn up by the Germans,[6] but Switzerland was never attacked. Switzerland was able to remain independent through a combination of military deterrence, economic concessions to Germany, and good fortune as larger events during the war delayed an invasion. Attempts by Switzerland's small Nazi party to cause an Anschluss with Germany failed miserably. The Swiss press vigorously criticised the Third Reich, often infuriating its leadership. Under General Henri Guisan, a massive mobilisation of militia forces was ordered. The Swiss military strategy was changed from one of static defence at the borders to protect the economic heartland, to a strategy of organised long-term attrition and withdrawal to strong, well-stockpiled positions high in the Alps known as the Réduit. Switzerland was an important base for espionage by both sides in the conflict and often mediated communications between the Axis and Allied powers.
Switzerland's trade was blockaded by both the Allies and by the Axis. Economic cooperation and extension of credit to the Third Reich varied according to the perceived likelihood of invasion, and the availability of other trading partners. Concessions reached their zenith after a crucial rail link through Vichy France was severed in 1942, leaving Switzerland completely surrounded by the Axis. Over the course of the war, Switzerland interned over 300,000 refugees, 104,000 of which were foreign troops, interned according to the Rights and Duties of Neutral Powers outlined in the Hague Conventions. 60,000 of the refugees were civilians escaping persecution by the Nazis. Of these, 26,000 to 27,000 were Jews.

The Grossmünster cathedral and waterfront in modern day Zürich
Women were granted the right to vote in the first Swiss cantons in 1959, at the federal level in 1971, and after resistance, in the last canton Appenzell Innerrhoden in 1990. After suffrage at the federal level women quickly rose in political significance, with the first woman on the seven member high council being Elisabeth Kopp from 1984–1989. The first female president was Ruth Dreifuss, elected in 1998 to become president during 1999. (The Swiss president is elected every year from those among the seven member high council). The second female president currently holds the 2007 Swiss high office, Micheline Calmy-Rey. She is originally from the French-speaking western area of canton Valais (Wallis in Swiss German). She is presently joined on the seven member cabinet/high council by a second woman, Doris Leuthard, from the canton Aargau. In 1979 areas from inside the previous borders in the canton of Bern attained independence from the Bernese, forming the new canton of Jura. On 18 April 1999 the Swiss population and the cantons voted in favour of a completely revised federal constitution.
In 2002 Switzerland became a full member of the United Nations, leaving the Vatican as the last widely recognised state without full UN membership. Switzerland is a founding member of the EFTA, but is not a member of the European Economic Area. An application for membership in the European Union was sent in May 1992, but not advanced since the EEA was rejected in December 1992 when Switzerland was the only country to launch a referendum on the EEA. There have since been several referendums on the EU issue, with a mixed reaction to these from the population, the membership application has been frozen. Nonetheless, Swiss law is gradually being adjusted to conform with that of the EU and the government has signed a number of bilateral agreements with the European Union. Switzerland, together with Liechtenstein, has been completely surrounded by the EU since Austria's membership in 1995. On 5 June 2005, Swiss voters agreed by a 55% majority to join the Schengen treaty, a result that was regarded by EU commentators as a sign of support by Switzerland, a country that is traditionally perceived as independent, neutral, or isolationist.