A union between Moldavia and Romania was confirmed by the Treaty of Paris (1920), but this was not recognised by the Soviet Union. After World War II, parts of Moldavia were made into the Soviet Socialist Republic of Moldavia, and the most eastern parts were handed over to Ukraine. In 1991, the Moldavian SSR declared independence under the name "Moldova." The names "Moldavia" and "Moldova" descend from the old German "Molde", meaning "open-pit mine", reflective of a strong early presence of imported German miners and a once-vital mining industry.