During the 20th century, substantial Jewish settlement began in Bolivia. In 1905, a group of Russian Jews, followed by Argentines, settled in Bolivia. In 1917, it was estimated that there were 20 to 25 professing Jews in the country. By 1933, when the Nazi era in Germany started, there were 30 Jewish families. The first large Jewish immigration occurred during the 1930s; the population had climbed to an estimated 8,000 at the end of 1942. During the 1940s, 2,200 Jews emigrated from Bolivia to other countries. But the ones who remained have created communities in La Paz, Cochabamba, Oruro, Santa Cruz, Sucre, Tarija and Potosí. After World War II, a small number of Polish Jews immigrated to Bolivia.