If Malaria and Yellow Fever were the sole problem about Africa it'd be easy. Until the mid 1800's almost all US had Malaria and Yellow Fever outbreaks and it didn't stop Northern Europeans immigrants to come. If I'm not wrong, even Lincoln had Malaria more than once.
As for Portuguese Africa, as most people said, most of the Portuguese settled there under the Facist regime in the mid 1900's and there was never a massive settlement there. They were a really small part of these colonies population: Angola had about 6 million inhabitants and a population of 400,000 Europeans and 100,000 mixed race by 1970.
They were not immigrants, they were colonizers. They were public servants, land-owners, businessmen... Of course, the real work was done by the native African servants.
As for Portuguese Africa, as most people said, most of the Portuguese settled there under the Facist regime in the mid 1900's and there was never a massive settlement there. They were a really small part of these colonies population: Angola had about 6 million inhabitants and a population of 400,000 Europeans and 100,000 mixed race by 1970.
They were not immigrants, they were colonizers. They were public servants, land-owners, businessmen... Of course, the real work was done by the native African servants.