1. Will I lose my US citizenship if I get my PR in Canada?

2. If you renounce your US citizenship can you get it back?

3. Now when you are a citizen of other countries can you ever come back to the US as a citizen of those countries? If so how much time can you spend there?

4. Do you have to be outside of the US to renounce your US citizenship?

5. Can you renounce your only citizenship?

https://nomadcapitalist.com/2018/01/17/renounce-us-citizenship-ultimate-guide/