Extracurriculars need not be pre-professional, nor do they need to show your commitment to your major – do what you love, and find ways to dig deeper into those activities to get the most out of them (for you, not your applications). However, given your interests, I imagine you could be interested in any of the following: Model UN, volunteering for a local politician (could be anything from school board to senator – try volunteering on campaigns or for the political party of your choice), school journalism, get-out-the-vote campaigns, community service with refugee or immigrant communities (even better if you speak a language that would help you serve these communities), volunteering at a local historical site or museum.
I see above that you’re thinking about starting any number of these activities, so figure out which makes the most sense for you and take the initiative.