Ukulele is also highly regarded by the royal family and nobles, such as King Kalakaua, Queen Emma and Queen Liliuokalani, who have played Ukulele. As a result, Ukulele has been accepted by more Hawaiians. From fishermen, taro growers, to kings and queens, everyone loves to learn and play Ukulele. Around 1915, the Ukulele piano flew to the North American continent. Hawaiian music hit San Francisco and swept across the country, stimulating the sale of Ukulele on the North American continent. This whirlwind also swept through the Atlantic to the UK.
The huge demand of Ukulele piano led to the production of Ukulele. By 1910, only three of the three original Portuguese producers were still in Manuel Nunes. The order is too large for him to cope. Young Samuel Kaialiilii Kamaka began apprenticeship with Manuel Nunes. New competitors have also joined the Ukulele piano production, which has led to the innovation of Ukulele piano design and sound quality. One of the competitors, Kumalae, opened a new factory that can produce 300 pianos per month. Despite the competition, the business is still full of orders.
In 1915, competitors from the continental United States also joined the Ukulele piano production. The Hawaiians are very angry and disappointed. Because these companies in the continental United States have carved the words made in Hawaii. The Hawaiians countered and they designed different trademarks to be protected by law. Hawaiian Ukulele piano producers are authorized to mark the words "Made in Hawaii" on Ukulele. This distinguishes the Ukulele pianos that are not produced in the Hawaiian Islands.
In the 1920s, American mainland producers, like Gibson, Harmony, Regal, National, Dobro, and Martin, produced thousands of Ukulele pianos in large quantities. Based on the design of ManuelNunes, Martin produced the first Ukulele in 1916. Many Hawaiians praised Martin's Ukulele, calling it the sound quality of the Ukulele.