Real life immigration in Europe and North America is a big topic. Considering generally people migrate for a better economic life, since life on Earth in the Star Trek universe seems to be the case where the standard of living is pretty good globally (no poverty etc), there would be little reason for economic migrants from the South of the planet to the North, or from East to West. For example, the standard of living on the African continent would be pretty much the same as Western Europe and North America, so there would be less need to move around globally, 'for a better life' until molecular transportation becomes the norm probably by the TNG era.
However with a United Earth state, 'free' movement of labour should also be a norm, with the UT if one wants a new job/career, people should be able to apply for work if they live in London but want a job in Cairo. Nation states like Japan which today are 99% mono cultural, should be as diverse as the USA.
Most of the migration should be offworlders from other Federation planets, rather than humans moving from nation to nation.
What say you guys?
However with a United Earth state, 'free' movement of labour should also be a norm, with the UT if one wants a new job/career, people should be able to apply for work if they live in London but want a job in Cairo. Nation states like Japan which today are 99% mono cultural, should be as diverse as the USA.
Most of the migration should be offworlders from other Federation planets, rather than humans moving from nation to nation.
What say you guys?