As long as you are not Laissez Faire (don't remember what party Texas starts out as), you can make social reforms for a steep price in the politics screen. Click that one, and then you should see three 3d buttons, the top being your current party, second voting rights/free press etc., and third social reforms. Unfortunately you can't get rid of slavery except by event. Since that event fires only when Texas is part of the Union, I don't think you can abolish slavery as Texas unless you write your own event. If I remember correctly Texas starts out with a very low population to begin with. In order for immigration to occur you mainly need two things, jobs, and social reforms. Make sure your workers have good healthcare and a decent working environment. Then make sure you have put up rails and have a few profitable factories. Assuming that every space in your factory isn't filled immigrants should come to fill it. Expand your factories if you need more slots available. There is the fast way and the not so fast way. First you can convert farmers or laborer POPs to soldiers for more manpower instantly. Click one of your big farmer stacks, like 100000 men. Convert them to soldiers and you'll notice that your manpower rating just shot up. You can now recruit new divisions. Another way is to max out defense spending. Your manpower and leadership will grow on their own and you can recruit divisions that way, or store reserves. As Texas you shouldn't really have a large standing army, so recruit what you think you need and store the rest as reserves. Hope that helps.