What documents do I need to transfer from Taiwan Province Province to the United States?

Take off from Hongkong, as long as you don't leave the terminal in Taiwan Province Province, you don't need to apply for Taiwan Pass or Taiwan Province Entry Permit.

When taking off from the mainland and passing through Taiwan Province Province, customs regulations require that a visa, a Taiwan Pass and a passport be presented at the same time.

Taiwan Pass (a pass for mainland residents to travel to and from Taiwan Province Province) is a travel pass issued by People's Republic of China (PRC) and the Ministry of Public Security for mainland residents to travel to Taiwan Province Province. When entering Taiwan Province Province, they shall be inspected together with the entry and exit documents issued by the Ministry of Interior and the Immigration Department of Taiwan Province Province.