Can I have 3 citizenships?

Yes, the U.S. does allow for triple citizenship and does not require naturalized U.S. citizens to give up citizenship in their home country or other countries.

https://www.boundless.com/immigration-resources/dual-citizenship/#:~:text=Yes%2C%20the%20U.S.%20does%20allow,home%20country%20or%20other%20countries.