A Real Citizen of Somewhere Else Moment

So on the way to the local Matsuri festival, the tsuma voted in yesterday's historic parliamentary defeat for the LDP. Inside the junior high school gym, onechan and I had the following conversation.

Onechan: What is mama doing?
Me: She's voting.
O: I want to vote, too!
Me: You can't yet. You have to be older.
O: Go-sai? [Five?]
Me: No, bigger. Like 18 or 20.
O: You should vote, too.
Me: I can't vote in Japan. I can only vote in America.
O: Why?
Me: Well, you have to be a citizen to vote. Mama's a citizen of Japan. I'm a citizen of the U.S.
O: America?
Me: Yeah. So I can only vote in America. And mama can only vote in Japan. But you and imoto can vote in both countries when you get old enough.
O: [not that impressed]
Me: And then when you're even older you'll have to decide which one country you want to be a citizen of.
O: [not that impressed]
Me: OK, mama's done. Time to go to the festival!
O: Yeah!!