So after getting the citizenship, is your old passport worthless?

[Defiance1]

I was wondering that. Can you still use the passport from your birth Country, or does it become "invalid" to travel now that you are a US Citizen?

 

[König]

It depends on whether your birth country allows multiple citizenships or not. The USA does not mind you using your other passports as long as you enter and exit the USA on your US passport.

 

[Triple Citizen]

All depends on the country or countries we are talking about. I have three valid passports that I can travel on because I hold three citizenships.

Can you still use the passport from your birth Country, or does it become "invalid" to travel now that you are a US Citizen?