Source: 📖 21 Lessons for the 21st Century ch9 p166

The three contractual conditions for immigration

1. The host country allows immigrants in.
2. In return, the immigrants must embrace the foundational norms and values of that country's culture, even at the cost of replacing their own.
3. Eventually, if the immigrants assimilate the culture sufficiently, they may become fully-fledged members of the host country. 'They' become 'us'.