I want to know the answer to the following question:
What is the cornerstone of Portugal's national identity?
All the background I'm provided with is that "It was one of the last western colonial European powers to give up its overseas territories (among them Angola and Mozambique in 1975), turning over the administration of Macau to the People's Republic of China at the end of 1999.". Is that enough to answer the question?
Answer: no