Turning Spain into Great power
Well, the question is what are the common strategies for Spain to challenge great powers. I`m playing as Spain in VIP0.2, and feel that I`m stuck, for it seems the resourses to develop are very limited.
The current situation is that I have nice industry (steamer and hull shipyards, regular clothes and steel factories etc.) which provides me with 200p a day (all taxes are 20%, tariffs not maxed), I have 250,000 in treasury, 150 manpower, 40 divisions, 40 ships (but only 15 of them are "modern" warships). My home population is rather happy (except for Phillipines) with conservative interventionist party. I have South africa, Oman, Oceania, Chile, Dominican Republic, Haiti - either owned or satellited.
The main problem I see is that I don`t have enough people to staff my factories...
The complications are:
- I`m (alone!) in war with USA , wich doesn`t accept peace in spite of my occupation of Florida and killing millons of their soldiers (AI persisted in attacking Santiago de Cuba ignoring other possibilities...

). And I don`t think I have powers to fight them on their mainland;
- Noone wants to be my ally - France or UK have +200 relations with me at times, but that doesn`t work;
- Good targets like Portugal and Morocco are guaranteed by great powers.
- I cannot grant statehood to colonies due to impressive unwillingness of spaniards to live there + cant promote POPs there (ruling party doesn`t favor Full citizenship).
Once my long term goal was to restore spanish rule in SA (Venezuela in particular), but now I feel that country is stagnating, and I cannot find resource to fuel its development for the rest of the game. May be going liberal might be an option? Or taking the rest uncivs that France or Germany haven`t grabbed yet?
Also I noticed that wars between Great powers are very rare by 1900s - is that common experience?