For many people, just hearing the name Switzerland conjures up visions of snow-capped mountains, azure lakes, and fields covered in wildflowers. The name is synonymous with peace, diplomacy, and serenity, along with a solid work ethic driven by efficiency. Its central location in Europe, along with its famed neutrality, has enabled it to serve as the meeting place for negotiating the end of World War II and establishing the United Nations. Its position in the world, along with its harmonious blend of four languages and varying cultures within a single nation, make it a prominent example of peaceful coexistence. The history of Switzerland reflects its diversity. During the Iron Age, the region was occupied by some of the Celtic tribes spread across Europe, particularly the Helvetians. Eventually, this area was occupied by Roman troops, remaining part of the Roman Empire until its collapse in 476. The Celtic and Roman origins linger today, as the official name for Switzerland is actually Confoederatio Helvetica, the Latin term for Swiss Confederation. The name, or abbreviation CH, often appears on currency and official documents. Like the rest of Europe, Switzerland adopted the feudal system and was later part of Charlemagne's Empire in 800 and the Holy Roman Empire afterward. The Reformation also had a strong impact on Switzerland. Because of this, there are a number of beautiful churches, castles, and cathedrals throughout the country. Even early on, Switzerland feared losing its autonomy to the powerful nations at its borders, especially the opening of an important trade route through the Alps. On August 1, 1291, the ruling families of Switzerland signed a charter pledging mutual support to each other; an act later considered the founding of Switzerland. Because of this, August 1st is honored as Switzerland's National Day. People celebrate with paper lantern parades, bonfires, and fireworks. One of the unique characteristics of Switzerland is its combination of various cultures and languages. Switzerland recognizes four official languages: French, German, Italian, and Romansh. Of the 26 Swiss cantons, or states, 22 identify a single language as its official one. Romansh, which sounds similar to Italian, is spoken in the canton of Graubünden, which includes less than 1% of the population. Most of the population (64%) speaks Swiss German, a distinct dialect, and writes in standard German. Although English is not an official language, it is often used as the common language of business in Switzerland. Because of this, many people in Switzerland speak English, especially in the cities. However, in smaller villages, it might be best to consider the canton's proximity to Germany, France, or Italy to determine the prevailing language.