Raising Population Quickly

[BebopFx]

I'm in 1907, hedg run. I need to raise my population by leaps and bounds in order to get the last task done, have half of worlds pops under my control. Problem is that people are migrating out of my country too, and all my colonies are barebones in population. Personally think I can't change things fast enough to make a difference, any suggestions?

[kgkong]

Close your borders and restrict discriminatory pop group movement.
Improve SoL and productivity of job opportunities for your states.
People are leaving your states because the rest of the states that make up your trade market are providing better opportunities, better SoL than you can.

[High Lord Denix]

Just go conquer China

[kgkong]

I should correct myself. Migration control will be better than closing your borders, but closing your borders will stop the migration that is happening.

[teron]

Getting the Intelligentsia to +10 approval can also help due to their Propagandists migration pull buff. Which is even stronger if they are powerful.

If you have colonies, you could swap to Colonial Resettlement which gives +100% Migration attraction in unincorporated states. Then start building resources in those colonial states.
Yes you would loose the though put bonus from being Colonial Exploitation, but it sounds like your focus is pops.

Other thing I found works well, is find a large incorporated state that has a ton of Arable land available, even better if it already has some construction industry and some universities. Then though the greener grass campaign on that state and spam buildings in the state.

Idea being that your construction will suck up pops from the subsistence farms and start raising the states average SOL. Which then since there is a higher SOL + available land + Greener Grass Makes it attractive, thus causing people to keep moving there.
Just remember to layer in adding railways and ports.

Also keep an eye on the state's population, since over populated states start loosing attraction. Where as states that have a low population are more attactive.