linguistic:translation
Race

London shared common concerns among many European Americans in California about Asian immigration, described as " the yellow peril "; he used the latter term as the title of a 1904 essay. This theme was also the subject of a story he wrote in 1910 called " The Unparalleled Invasion ". Presented as an historical essay set in the future, the story narrates events between 1976 and 1987, in which China, with an ever-increasing population, is taking over and colonizing its neighbors with the intention of taking over the entire Earth. The western nations respond with biological warfare and bombard China with dozens of the most infectious diseases. On his fears about China, he admits (at the end of "The Yellow Peril"), "it must be taken into consideration that the above postulate is itself a product of Western race-egotism, urged by our belief in our own righteousness and fostered by a faith in ourselves which may be as erroneous as are most fond race fancies."

By contrast, many of London's short stories are notable for their empathetic portrayal of Mexican ("The Mexican"), Asian ("The Chinago"), and Hawaiian ("Koolau the Leper") characters. London's war correspondence from the Russo-Japanese War, as well as his unfinished novel Cherry, show he admired much about Japanese customs and capabilities. London's writings have been popular among the Japanese, who believe he portrayed them positively.

In "Koolau the Leper", London describes Koolau, who is a Hawaiian leper—and thus a very different sort of "superman" than Martin Eden—and who fights off an entire cavalry troop to elude capture, as "indomitable spiritually—a... magnificent rebel". This character is based on Hawaiian leper Kaluaikoolau, who in 1893 revolted and resisted capture from forces of the Provisional Government of Hawaii in the Kalalau Valley.

Those who defend London against charges of racism cite the letter he wrote to the Japanese-American Commercial Weekly in 1913:

In reply to yours of August 16, 1913. First of all, I should say by stopping the stupid newspaper from always fomenting race prejudice. This of course, being impossible, I would say, next, by educating the people of Japan so that they will be too intelligently tolerant to respond to any call to race prejudice. And, finally, by realizing, in industry and government, of socialism—which last word is merely a word that stands for the actual application of in the affairs of men of the theory of the Brotherhood of Man.

In the meantime the nations and races are only unruly boys who have not yet grown to the stature of men. So we must expect them to do unruly and boisterous things at times. And, just as boys grow up, so the races of mankind will grow up and laugh when they look back upon their childish quarrels.

In 1996, after the City of Whitehorse, Yukon, renamed a street in honor of London, protests over London's alleged racism forced the city to change the name of "Jack London Boulevard" back to "Two-mile Hill".

Shortly after boxer Jack Johnson was crowned the first black world heavyweight champ in 1908, London pleaded for a "great white hope" to come forward to defeat Johnson, writing: " Jim Jeffries must now emerge from his Alfalfa farm and remove that golden smile from Jack Johnson's face. Jeff, it's up to you. The White Man must be rescued."