The decisive difference is that in today’s international arena there are huge obstacles to forming global political institutions that have no analogues from the era of national state-formation, namely powerful national governments whose leaders command both widespread political legitimacy and coercive resources.
Moral foundation of politics by Ian Shapiro
My question is what does 'that' belong to (emphasis mine)? To 'huge obstacles' or 'global political institutions? And how can I determine this in other similar sentences please explain to me.