The identifying terms we use (and the political history behind them)

Today's political climate has all sorts of terms being thrown around with varying meanings and history behind them. There are Liberals (political ideology for FREEDUM), and Liberals (foreign policy), and Liberals (economic policy), and Liberals ("conservatives"), and Liberals ("centrist, anti-absolute monarchists"), and Liberals ("democrats"), and Liberals (some other field that annoys the shit out of me). There are Progressives, and Conservatives, Nationalists, Socialists, Social Democrats, unreconstructed Monarchists, Reconstructed Monarchists, Anarchists, and I'm sure some other political identity that I've missed.

So, given the rather long list of ways to identify politically, and the just about as long history for those ways to identify politically, I thought we should have a discussion focused exclusively on the political history of the terms we used.

So, the questions:

1. What terms do you commonly use to describe yourself and others in your political environment? 
2. What is the relevant history that informs the way you use common political terms to describe yourself and others?
3. Got any links, movies, books, etc., that delve into that history?

This has the potential to get hairy because of how broad it is, so I'm going to try to remind people of some best practices that I use when engaging in meaningful discussion:

• Understand before criticizing. - Be able to frame someone's view in a way that they can agree with themselves before critiquing their view. Questions are your friend, but make sure the questions are focused on better understanding someone's view, not on biasing reactions to a view.
• Assume good faith. - Calling people "trolls" makes me very angry. Don't do it. For any reason. To anyone. If your case is so bulletproof that you'd be willing to call someone out for it here, take it to @Deimos instead. I don't want to read it here.
• I Could Be Wrong - There is nothing wrong with having confidence in your view, but there should be some part of you that recognizes you can be wrong about whatever claim you make. Nothing is 100%. Absolutely Only Sith Deal In Absolutes, etc.