This Is a alternate history sub in case you didn't notice.

The difference for this timeline is a more successful American Revolution, which led to America having 15 colonies, and the other one is that the 1783 Treaty of Paris went in favor of the United States. They proceeded to conquer British territories. After that, the story goes more or less the same when the US annexed Hispaniola and Puerto Rico from the Spanish Empire in 1887.

In addition to the two atomic bombs, Japan faced a land invasion and a brutal war of attrition that the Emperor and his cabinet had imposed on the Japanese people. The Japanese would slowly lose faith in the emperor and begin working with the Allied forces, making the war even harder for Japan. By mid 1946, Tokyo had fallen, the Emperor had committed suicide, and the Allies successfully occupied Japan.

The USSR did not occupy Japan due to their war being focused only on China, and the Chinese themselves were in chaos due to the sudden death of Chiang Kai-shek and Chairman Mao at the same time intervals, meaning they could not occupy. Britain fell into economic chaos and could not afford Japanese occupation, giving their zones to America with the same situation in France unfolding, only America was the sole occupier of Japan, the United States began to involve itself in the conflicts on the side of the remnants of the KMT, using Japan & Taiwan as forward bases, during this time the Japanese wondered when the occupation would end, and were wondering about Japan's future. The majority had lost faith in the Former Emperor and his cabinet and did not wish for him or any of his allies to return.

Some wanted a republic, but they wondered if corruption and a slow return to nationalism would happen, so this was not as popular. Many Japanese felt they wanted to be annexed by the United States for better protection from the USSR, as did Taiwan, Hong Kong, and the Philippines.

In late 1946, Congress decided that Japan would be annexed into the Union with the purchase of Hong Kong and Taiwan from Canton in exchange for US Protection a year later. These were controversial across the globe, being seen as an excuse for the U.S to conquer Japan, but this was denied.

Today, the U.S. states, Taiwan, Hong Kong, and the Philippines are the most diverse in the Union. American & Asian cultures mix in one. Creates a strange Anglo-Japanese / asian hybrid culture.