There are several reasons. Here are a few: One, because wealthy people sometimes want 'dual citizenship' (which has to be kept a secret in the U.S.) because th

There are several reasons. Here are a few: One, because wealthy people sometimes want 'dual citizenship' (which has to be kept a secret in the U.S.) because they feel like if things fall apart in one country, they can quickly escape to another. Two, some business transactions require citizenship. Three, some rights are only available with citizenship. There are other reasons as well.