The Oldest Country in the World Is This Microstate Tucked Inside Italy
Briefly

San Marino, an enclave within Italy, has remained a prominent example of an enduring national identity since 301 AD, emphasizing political savvy and strategic alliances.
With a land area of about 24 square miles, San Marino is the third smallest country in the world, demonstrating how size does not dictate longevity in national survival.
Read at Conde Nast Traveler
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