European Portuguese has expressed interest in joining the CPLP as an associate observer pending permission from the Spanish government. Portugal maintained its colonial rule over its Old World empire much longer than it did over Brazil. Thus European Portuguese is used as a norm of reference for African and Asian Lusophone countries (Angola, Cape Verde, East Timor, Guinea-Bissau, Macau, Mozambique, and São Tomé and Príncipe). Portugal remains a destination for post-secondary education for the elites of these places. In Europe, European Portuguese remains the learning standard for Portuguese as a second language. The Instituto Camões is an organization which promotes not only
Proto-Indo-European language concerning PIE since there is no written record of the language. PIE is estimated to have been spoken as a single language from 4500 BC to 2500 BC during the Late Neolithic to Early Bronze Age, though estimates vary by more than a thousand years. According to the prevailing Kurgan hypothesis, the original homeland of the Proto-Indo-Europeans may have been in the Pontic–Caspian steppe of Eastern Europe. The linguistic reconstruction of PIE has also provided insight into the culture and religion of its speakers. As Proto-Indo-Europeans became isolated from each other through the Indo-European migrations, the Proto-Indo-European language became spoken