Why don't Japanese need a visa to go to Hawaii?

Hawaii is a state in the United States, and there is a visa-free agreement between the United States and Japan, so Japanese people don't need a visa to go to Hawaii.

Why are there so many Japanese immigrants in Hawaii?

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The period of 1870- 1880 was the period of the development of modern agriculture in Hawaii, especially the sugar industry. At that time, Japan was experiencing an era of transition to a modern economy, with a high unemployment rate and a hard life, so many Japanese went to Hawaii to farm. Although some Japanese returned to Japan, many Japanese stayed and went to Hawaii one after another. Around 1920, the Japanese once accounted for more than 40% of Hawaii's population, and now they still account for more than 15% of the total population.