That's a very good question. Sometimes, in my country anyway, I feel that this divide is almost deliberate. Not just much political parties, but on lots of different issues. The way the news is presented seems to vary depending on where in the country you live.
An example: There was about 4 years in a row where my
local news reported that there was a crop failure for wheat in Alberta. During that time, the price of a big bag of flour went from $4 to $16. At the end of year 4, I had friends visiting from Alberta and they were shocked at how much we were paying for flour as it's only $2.50 in their shops. These same four years, their news reported there, that there was a glut of wheat produced and when my friends drove in the country, they could see the wheat being left to rot in the fields because there was too much wheat to
sell to the marketing board. The media where I live was frustrated at the farmers for not growing
enough, the media in Alberta was frustrated at the customers for not buying enough. In reality, the problem was purely manufactured by marketing boards and media. But now there's one more wedge between us and the people who grow our nation's
staple crops.
I think that this event really opened my eyes to something I suspected for a while. The strategy of divide and conquer seems to be very popular. If a population spends their
energy fighting aginst themselves, then they spend less energy looking at what is actually going on.
I think
the first step to closing the divide, is to be alert to the idea that these ideological divides could be deliberately manufactured. Possibly, your friends (and even yourself) are being manipulated into fighting with each other?
Another
experience that really hammered this home is reading (or more to the point, re-reading as an adult) 1984. The idea that system could be set up with the pure goal of maintaining power for power's sake, not for purely personal gain, is very interesting. The big problem with that book, why I feel it could never be 'real' is that it forgot to give the people the illusion of choice. Do you want 'broccoli or carrots for dinner' give the child the feeling they have a choice without alerting them to the fact that they are being manipulated into eating a veg.