5 Hardest Countries to Get Citizenship in 2023

4. Bulgaria

Access to Nationality: 13

Prerequisite Residency Timeline: 5 Years

Bulgarian citizenship can be obtained via naturalization by fulfilling certain criteria, including being at least 18 years old, holding permanent residence for the past 5 years, maintaining a clean criminal record, demonstrating financial self-sufficiency, and showcasing adequate proficiency in the Bulgarian language.