What are the commitment in the relationship of Gabriella and liam in the story of nluffing

What is the central idea in this advice from branch rickey to jackie robinson?  

In 150 words, describe what arthur would say to the captain in response to his questions in twelve years a slave. writer next question ask for turn it in

How can we make the world a better place, specifically towards discriminated people (lgbtq+ community, people of color, people with disabilities etc.) how can we make them change their view on people they call "different"? how can we get people to love one another despite how they look or who they love or where they are from? 2-3 paragraphs ! (ᵔᴥᵔ)