>>54169
Some stuff to add.
Quick sum of Constructivism:
How states (and other participants) behave in international relations stem from their view of themselves and the others. How they see themselves, how they see others.
So we can observe me adding this liberals see themselves as the morally right, the champions of freedom, democracy, and socio-economic welfare. They see others as dictators, oppressors, racists, imperialists, slavers, ethnic cleansers, etc. Danger in short. And no matter how awful those regimes are which liberals support all around the world they'll find a way to spin the narration to their favor.

As for liberalism in international relations. For liberals states - and indeed nations - are things of the past. For them states are surpassed and they should not exist. They say the actors of international relations are institutions, companies, and even individuals. In their mind they already live in this world, so it is natural for them, that while they live and are citizens in country X, they feel they have the right to tell the citizens of Y country what to think and how to behave. They see themselves as citizens of the world, a cosmopolitan.
I want to refer to my Theory of Power, you can find it somewhere on these pages if you look hard enough. People want more power and keep power reminder: power is the ability to make decisions. So liberals are all for freedom while they want others to share the power with them, but when they get into the position of power they turn authoritarian. They want to tell others what to think and do. Simple. There is a tyrant within every liberal.
Liberals are very militant and belligerent. Unlike Realists the classic school of international relations, who are pragmatists essentially, Liberals have an ideological and emotional bias, they feel right and they feel very strong about it. Liberals in international relations will seek out differences with others and they will clash with them about it. Realists who see interests and are willing to compromise are way, way less belligerent.
Liberals also believe in democratic peace theory. They believe democracies don't war each other. If they see the living example which refutes, dispels this flawed opinion, they will argue that one side (whom they label as aggressor) is not a real democracy. That is usually a liberal democracy.
Moreover they feel justified by democratic peace theory to launch and provoke wars against those whom they consider enemies. They want to turn them to democracies "democracies" to achieve this global peace.