Esperanto

Esperanto is a language that was developed in 1887 by Ludwik Zamenhof with the specific intent of creating an international second language. In 1905, Zamenhof published his Fundamento de Esperanto, which lays down the basic principles of the language's structure and formation. About 75 % of Esperanto's vocabulary comes from Latin and Romance languages (especially French), about 20 % comes from Germanic languages (German and English), and the rest comes mainly from Slavic languages (Russian and Polish) and Greek (mostly scientific terms). The grammar of Esperanto was designed to be very regular to make it easy to learn and, because it employs free word order (with case marking), speakers from different language families can translate from their native languages into Esperanto nearly word for word and still speak perfectly intelligible and grammatically correct Esperanto. Interestingly, Esperanto has not formed any dialects in its more than one hundred years of existence. Regional dialects appear when people communicate mostly with their geographical neighbours and rarely with people from further away. Since Esperanto is primarily used in long-range communication, dialects have not formed.
Esperanto was created on the idealistic hope of breaking down barriers across cultures and providing a neutral and easily learnable common language for the world. Indeed, many Esperanto enthusiasts still share this hope and have formed a number of international societies to meet and correspond with people around the world. It is estimated that there are approximately 2 million speakers of Esperanto, although an accurate count is hard to come by. Compared to the dreams of Zamenhof, the present number of Esperantists, whatever it might be, is very small. However, that Esperantists have created an international linguistic community whose numbers equal the population of a small country is an unprecedented achievement. These Esperantists learned their new language, often on their own, and use it to maintain contacts with their fellows throughout the world.

Sources:

Esperanto.com
Verkoj de Sylvan Zaft
Esperanto.net


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Other Local resources:

UCSD International Center
International web radio