In Hawaii

The arrival of American Protestant missionaries (from New England) in 1820 marked another new phase in the development of the Hawaiian language. Their evangelical mission had been inspired by the presence of several young Hawaiian males, especially Obookiah (ʻŌpūkahaʻia), at the Foreign Mission School in Cornwall, Connecticut. The missionaries wanted to convert all Hawaiians to Christianity. In order to achieve that goal, they needed to learn the Hawaiian language so that they could publish a Hawaiian Bible, preach in Hawaiian, etc. To that end, they developed a successful alphabet for Hawaiian by 1826, taught Hawaiians to read and write the language, published various educational materials in Hawaiian, and eventually finished translating the Bible. Missionaries also influenced King Kamehameha III to establish the first Hawaiian-language constitutions in 1839 and 1840.This is the 115–year period during which Hawaiian-language newspapers were published. Missionaries introduced newspaper publishing in Hawaiian and in English, and played a significant role in publishing a grammar (1854) and dictionary (1865) of Hawaiian. Literacy in Hawaiian was widespread among the local population, especially ethnic Hawaiians. Use of the language among the general population might have peaked around 1881. Even so, some people worried, as early as 1854, that the language was "soon destined to extinction" (quoted in Schütz 1994:269–270). In spite of a huge decline in the use of Hawaiian, compared to the era of its peak, those fears have never been realized.

The increase in human travel to and from Hawaiʻi during the 19th century was the means by which a number of diseases arrived, and potentially fatal ones, such as smallpox, influenza, and leprosy, killed large numbers of native speakers of Hawaiian. Meanwhile, native speakers of other languages, especially English, Chinese, Japanese, Portuguese, and Ilokano, continued to immigrate to Hawaii. As a result, the actual number, as well as the percentage, of native speakers of Hawaiian in the local population decreased sharply, and continued to fall.

As the status of Hawaiian dropped, the status of English in Hawaiʻi rose. In 1885, the Prospectus of the Kamehameha Schools announced that "instruction will be given only in English language" (see published opinion of the United States Court of Appeals for the Ninth Circuit, Doe v. Kamehameha Schools, case no. 04–15044, page 8928, filed August 2nd 2005).

For a variety of reasons starting around 1900, the number of native speakers of Hawaiian diminished from 37,000 to 1,000; half of these remaining are now in their seventies or eighties (see Ethnologue report below for citations). There has been some controversy over the reasons for this decline.

One school of thought claims that the most important cause for the decline of the Hawaiian language was its voluntary abandonment by the majority of its native speakers. They wanted their own children to speak English, as a way to promote their success in a rapidly changing modern environment, so they refrained from using Hawaiian with their own children. The Hawai'ian language schools disappeared as their enrollments dropped: parents preferred English language schools.

Another school of thought insists either that the government made the language illegal, or that schools punished the use of Hawaiian, or that general prejudice against Hawaiians (kanakas) discouraged the use of the language. (See below, "Banning" of Hawaiian)

A new dictionary was published in 1957, a new grammar in 1979, and new second-language textbooks in 1951, 1965, 1977, and 1989. Master's theses and doctoral dissertations on specific facets of Hawaiian appeared in 1951, 1975, 1976, and 1996.