Yankwich was nominated by President
Franklin D. Roosevelt on August 21, 1935, to the
United States District Court for the Southern District of California, to a new seat authorized by 49 Stat. 508. He was confirmed by the
United States Senate on August 23, 1935, and received his commission on August 24, 1935. He served as Chief Judge from 1951 to 1959. He assumed
senior status on April 28, 1964. Yankwich was reassigned by
operation of law to the
United States District Court for the Central District of California on September 18, 1966, pursuant to 80 Stat. 75. His service terminated on February 9, 1975, due to his death. Yankwich decided several important cases involving racial minorities. He invalidated segregation in
Lopez v. Seccombe (1944), a decision prohibiting discrimination against persons of Mexican ancestry in San Bernardino's public recreational facilities. In
Uyeno v. Acheson (1951), he held that a birthright citizen had not been
expatriated by voting in an election in
Occupied Japan in 1947: "In the present case, the testimony of the plaintiff is that the constant reiteration through newspapers and over the radio, and by friends and advisers of the importance of voting and the need for voting was taken by him as 'a command' on the part of General MacArthur and the Occupation Forces to vote, which he could not, with impunity, disobey. Indeed, he testified that, in addition to this, he was led to believe that if he did not vote, he would lose his food ration card." ==References==