Smart immigration
(1) Stop diversity visa program.
(2) stop allowing anyone to bring in relatives like brothers and sisters.
(3) enforce more agressively our immigraiton laws and allow citizenship to be revoked even after many years if raud is discovered.
(4) raise - slightly - the financial requirements for immigration from 125% of poverty guidelines to 150% so that folks are not arriving and immediately seeking financial support from the state - AND audit these financial sponsors so one person with a $50K income is not sponsoring 100 people (as has happened)
(5) eliminate universal, politically correct immigration- such that we essentially ban immigration from many islamic countries where the populayions are hostile towards the US and security concers require far too many resources ...
This would create a sense of confidence in what is happening with our immigraiton policies, especially amongst conservative, white, christian voters ...
THEN ... OPEN THE FLOODGATES!
Essentially allow anyone else with basic English language skills and a Bachelor's degree from a legitimate educational institution (which can easily be verified by our overseas diplomats and NGOs) to come to America with a 10-year residency requirement that does not automatically lead to citizenship (i.e. if they commit crimes, or end up needing welfare, etc)
You would have tens of thousands of Indians and Chinese arriving annually, plus many hundreds and thousands from other countries in S. America and Eastern Europe ...
10,000 Indians + 10,000 Chinese + 5,000 S. Americans + 5,000 E. Europeans per year (and these might be EXTREMELY LOWBALL ESTIMATES) = 30,000 per year of young, post-college immigrants who get marrie dand have approx. 3 children per couple X 50 years.
this is 1.5 billion plus the current population, plus all children.
Start this in 1985 and only run it for 25 years, you get 750,000 plus the current 300,000 = 1.05 billion.