What were the four eras of immigration

How do you think american life would change greatly, as soldiers went to war in europe?

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.

The national security act of 1947 reflected: