Being "Japanese" in Brazil and Okinawa

Friends of Historical Accuracy regarding the ethnic Japanese Evacuation of 1942

The following piece from the Japan Policy Research Institute whets my appetite for more knowledge of the history of Japanese-Brazilians. I have found bits and pieces of this history but nothing seems to be available, at least in English.

From what I have read, espionage in Brazil's ethnic Japanese community assisted in the sinking of 17 allied merchant vessels by German U-boats by August 1942. Ethnic Japanese fishing vessels provided information that led to the sinkings.

I also know ethnic Japanese fishermen based out of Terminal Island near Los Angeles had been photographed by the U.S. military flying Japanese flags on their boats off California.

My copy of "Kokutai no Hongi" was translated from a Japanese language copy found at a Japanese "Language School" in Brazil that had been closed.

Brazil waited until June, 1945 to declare war on Japan.

There are a lot of unanswered questions. If you know of a good source to study this history, please let me know.

This piece by Kozy Amemiya is a good read. One criticism is it lacks footnotes which makes it difficult for further study.

The link to Amemiya's piece at the Japan Policy Research Institute is here.