Kretoxian said:Are you completely sure???? The interactive map is completely correct, check it again.
According to wikipedia Indonesia achieved it's independence in 1949 as you can read here:
And they controlled western Papua-New Guinea since they were the colony of Dutch East Indies as it can see in the map here:
http://en.wikipedia.org/wiki/Indonesia
It's true that some Dutch troops stayed in Indonesian land until early 60s but for that date, Indonesia was completely independent.
http://en.wikipedia.org/wiki/Netherlands_New_Guinea
Papua-New Guinea remained part of the Netherlands until the early 60's