fusionism

From fusion + -ism.

fusionism (uncountable)

1. The political practice, principle or theory of forming groups.
2. (chiefly US politics) A political philosophy advocating fusion of traditionalist social conservatism with right-libertarianism.
   • 2009 February 13, Ross Douthat, “The Future of Liberaltarianism (II)”, in The Atlantic‎^[1], archived from the original on 21 March 2016:

     But it means being open to the possibility that the old fusionism, battered and bruised as it is, may still hold as much promise for the advancement of libertarian policy goals as "liberaltarianism" ever will.

• fusionist