1906, there were approximately 5,000 Japanese who lived within that section of town, making them the largest minority of the Fillmore district for a significant period of time. Like many of the ethnic groups in San Francisco, the Japanese faced discrimination. The type of discrimination a Japanese person could expect to face was slightly different than the discrimination an African American would face. Many Americans perceived the Japanese as foreigners and as citizens of another country. It was a widely held belief that the Japanese in San Francisco and the Fillmore were still loyal to Japan even though many were 2nd or 3rd generation American citizens. One Ozawa court case ruling exemplified this type of racism when it described the Japanese as “Aliens ineligible to citizenship”. This systemic racism towards the Japanese would eventually fuel the decision for the Issuing of executive order 9066 by president Franklin Roosevelt and the internment of all Japanese citizens. After the war, the Japanese slowly migrated back to the Fillmore district and the Japanese population would make its way back to pre-war levels within a few years. Noted Japanese monk Nyogen Senzaki, who is credited with introducing Zen Buddhism in the United States opened the first zendo in an apartment on Bush Street in the Fillmore. African-American community Although some African Americans were present in the Fillmore District after the 1906 San Francisco earthquake, it would not be until WWII when the Fillmore District and San Francisco as a whole began to have a large African-American population. Between the years of 1940 and 1950 the African American population of San Francisco grew from 4,836 to 43,460. The African American population went from 0.5% of the city's total population to 4.5% of the city's total population. A vast majority of these African Americans went on to occupy the Fillmore District. This large migration of African Americans was largely due to three major factors. The first of these factors is that the Japanese internment in 1942 left a large number of unoccupied homes and businesses within the Fillmore. The second factor was that the shipbuilding industry and wartime economy created by WWII brought a large number of wartime jobs into the city. The third factor was that Many African Americans left the south in the Great Migration in order to escape the Jim Crow laws which existed there. The large Influx of African Americans during and