jus soli 出生地主義
出生地主義 - Wikipedia
血統主義 - Wikipedia
「国籍」は揺らぎ続ける—世界の潮流から取り残された日本の国籍法 | nippon.com
「日本人」を定義してみてください | HuffPost Japan

What do you thinik about the Japanese nationality system," jus sanguinis"?
jus sanguinis 血統主義

How important is nationality ?

What is the problem of having dual nationality?

Will nationality become more or less important in the future?