Japanese Americans experienced which event during world war 2

What would lead a historian to consider two events to have a relationship of correlation rather than causation

Which of the following world and national events led to a new view of people with disabilities in the us:     a.  world war i and ii veterans with disabilities returned home after the wars.b.  john f. kennedy was elected president and had a sister with a disability.c.  the civil rights and feminist movements.d.  all of the above.

Select all the correct answers. what were two effects of the french revolution in france?