Back in 2015, Michael Hager wrote a very important missive that appeared in The Hill. Hager said:
The Biblical injunction that "No one can serve two masters" (Matthew 6:24) doesn't apply to nations. Almost half of the world's countries, including the U.S., recognize dual citizenship—even when they don't encourage it for the complicated legal issues it often raises.
For example, one who obeys a requirement to give allegiance to a country or votes in a foreign election may be regarded as having renounced citizenship in the other country. What happens when the legal claims of one country conflict with those of the second country? Which of the two countries has an obligation to assist a dual national in distress?