I played a Portugal game from the 1399 start and thus far I've colonized most of south America and the Caribbean, i'd like to move my capital to Rio de Janeiro and make a South American superpower nearly or entirely independent of European dependency. However i've run into difficulties, money problems and low population in the colonies, any tips on how to make a functional migration from Europe to the Americas? Particularly with capital shifting, what are the requirements to move it? Thanks in advance!