I tend to use the Lydekker line rather than the Wallace line to differenciate Asia and Oceania, but maybe I should use the Wallace line. That being said, Portugal never had colonies in North America afaik.
As for the USA, I don't count temporary military occupation as colonisation in itself, even though it can open the way for it, so I wouldn't say they colonised Europe.
NA (cuba, alaska, pr, usvi, etc..)
SA (occupied galapagos islands)
Europe (italy, germany, iceland, russia in ww2)
Africa (liberia, libyan/somalian occupation)
Asia (philippines, japan, iraq, afghanistan)
Oceania (plethora of island nations, nmi, guam, hawaii, etc etc etc)
As for the USA, I don't count temporary military occupation as colonisation in itself, even though it can open the way for it, so I wouldn't say they colonised Europe.