Issue of discrimination and segregation?

This is my main idea and my perspective: With the lack of unity and diversity in America, segregation and discrimination continue to exist, and as a result, Americans suffer from ill-treatment and unfair restriction from even doing a harmless activity.

These are my reasons:

- Because someone is different it was made difficult for them to work or even get hired.

- Because someone was different people did not support them but push them down and made fun of them and did not respect them.

- Because someone was different people limited them and made them feel like they couldn't even do the simplest everyday activity.

I just want to know are my reasons similar to each other especially the first and third one? Thanks!