My question is regarding to today society in general why is our country so divided?

My question is regarding to today society in general why is our country so divided? please provide 5-10 things that I can talk about for a 15 page essay around 3000 words count , it can be technology , our politic, etc. please also be specific, let's say I want to talk about politic , what topic can i talk about about that divide country , thank you