Yes it is true that despite fears that Japanese americans would be disloyal, only one Japanese American was ever convicted of treason against the US.
1. Marco Polo
2. Johann Gutenberg
3. Richard Hakluyt
4. Sir Walter Raleigh
5. John Smith
6. Roger Williams
7. George Calvert
8. William Penn
9. James Oglethorpe
10. James, the Duke of York