What were the main accomplishments of henry's voyages?

There are five main accopmplishments of Henry's voyages. Those are..

1.Mapping the West Coast of Africa

2.Founded the World’s First School for Oceanic Navigation

3. First Voyage beyond the Sea of Darkness

4.The Sea of Explorers

5.The Sea of Explorers

the answer is

a) revise existing treaties

b) do away with political alliances

c) prevent the spread of communism

d) bring an end to european colonization

the main goal of the southeast asia treaty organization was to prevent the spread of communism in southeast asia.