Spokane has hosted an annual multicultural celebration, Unity in the Community, since 1995. The city has become more diverse in recent decades. People from countries in the former Soviet Union (especially Russians and Ukrainians) form a comparatively large demographic in Spokane and Spokane County, the result of a large influx of immigrants and their families after the collapse of the USSR in 1991. According to the 2000 Census, the number of people of Russian or Ukrainian ancestry in Spokane County was reported to be 7,700 (4,900 residing in the city of Spokane), amounting to two percent of the county. Among the fastest-growing demographics in Spokane is the Pacific Islander ethnic group, which is estimated to be the third-largest minority group in the county, after the Russian and Ukrainian community and Latinos. Spokane was once home to a sizable Asian community, mostly Japanese, centered in a district called Chinatown from the early days of the city until 1974. As in many western railway towns, the Asian community started off as an encampment for migrant laborers working on the railroads. The Chinatown Asian community thrived until the 1940s, after which its population decreased and became integrated and dispersed, losing its Asian character; urban blight and the preparations leading up to Expo '74 led to Chinatown's eventual demolition.