partner-contact/partner_contact_birthplace/views/res_partner.xml

<?xml version="1.0" encoding="utf-8"?>
<!-- Copyright 2018 Simone Rubino - Agile Business Group
     License AGPL-3.0 or later (https://www.gnu.org/licenses/agpl). -->

<odoo>
    <record id="view_personal_information_birthplace" model="ir.ui.view">
        <field name="name">Birthplace field</field>
        <field name="model">res.partner</field>
        <field name="inherit_id" ref="partner_contact_personal_information_page.personal_information"/>
        <field name="arch" type="xml">
            <xpath expr="//group[@name='personal_information_group']">
                <field name="birth_city"/>
                <field name="birth_state_id"/>
                <field name="birth_country_id"/>
            </xpath>
        </field>
    </record>
</odoo>