The Americans with Disabilities Act claims that "The continuing existence of unfair and unnecessary discrimination and prejudice denies people with disabilities the opportunity to compete on an equal basis."

Why do the authors include Part 4 in this section? How is Part 4 related to the claim?
(1) some 43,000,000 Americans have one or more physical or mental disabilities, and this number is increasing.
(2) historically, society has tended to isolate and segregate individuals with disabilities, and, despite some improvements, such forms of discrimination against individuals with disabilities continue to be a serious and pervasive social problem.

(3) discrimination against individuals with disabilities persists in such critical areas as employment, housing, public accommodations, education, transportation, communication, recreation, institutionalization, health services, voting, and access to public services.

***(4) Census data, national polls, and other studies have documented that people with disabilities, as a group, occupy an inferior status in our society, and are severely disadvantaged socially, vocationally, economically, and educationally.****

(5) the continuing existence of unfair and unnecessary discrimination and prejudice denies people with disabilities the opportunity to compete on an equal basis.

I believe the author included Part 4 because people discredit people with disabilities because no one has faith in them. Just because they act a little differently or they cant do certain things we can, that doesn't mean they can't do anything.
@Mrs. Sue?
@Writeacher?

4 answers

This relates to the claim because people all over the nation voted that people with disabilities occupy an inferior status and are disadvantaged. People are discriminating against these human beings just because they are different.
I'm not familiar with the specifics of all these laws. Maybe Ms. Sue will have a better idea for you.
I think it is the argument for and against.
I would claim a side and explain thoroughly with your opinions.
This is based on logic. It is true according to Census data and not some one's personal view, thus including the the supporting document, the argument has validity - not just an opinion. Citing relevant proof to support an argument is what is shown in this case.
Moral: To support your hypothesis or thesis, provide supporting evidence and thus your argument will be accepted as valid or logical.