You will need to manage your own hosting (on premise deployment) if you require geographic isolation to the U.S.A.

Via the Odoo.sh hosting offering, you are able to choose to locate your container at any of the following GCP data centers:

• Europe: Saint-Ghislain, Belgium
• Americas: Council Bluffs, Iowa
• Asia: Singapore

 However backups do leave the U.S.A.

"Backups are replicated in at least 3 different data centers, on at least 2 different continents."

Several Odoo Partners offer to host and backup within the USA.

Find them at https://www.odoo.com/partners

Further information on hosting and security:

https://www.odoo.sh/faq

https://www.odoo.com/security