Portugal is one of the oldest countries in Europe. It has had the same state borders since 1139. How has Portugal managed to survive so many wars, crises and instabilities?

葡萄牙是欧洲最古老的国家之一。自1139年以来,该国的国界一直保持不变。葡萄牙是如何在如此多的战争、危机和不稳定中生存下来的?