Yes, it is possible to reach all the users in a specific country using Facebook if you follow the following procedure:
Add or Edit Country Restrictions: You can choose to show or hide your Page only to people in some countries. To add or edit country restrictions for your Page, you'll need to be an admin. If you are an admin:
1. From your News Feed, click ‘Flag icon’ Pages in the left menu.
2. Go to your Page and click ‘Cog and wheels’ Page Settings in the bottom left.
3. From General, click Country Restrictions.
4. Add one or more countries and choose to hide or show your Page to viewers in those countries.
5. Click Save Changes.
If no countries are listed, your Page will be visible to everyone.
Besides if you do have any questions give me a call: https://clarity.fm/joy-brotonath