What kind of speech? your question is unclear.
I think it's spelled 'patience'.
Answer:
"…led to fear of potential sabotage and espionage by Japanese Americans…"
Moving toward you or coming near. Ex Thr car veered onto the wrong side of the road and hit a oncoming track.
Yes, commas are used for clauses that help to provide a fuller picture, even when not necessary. Dashes can be used for a similar purpose as they are used here, but i don't believe it's appropriate in this sentence. Parentheses can only be used for information that can be completely written off without having any effect on the sentence.