Britain
Britain was awarded no new territory in Europe, but it gained Malta, Ceylon and the islands in the East and West Indies as part of its reward for its great effort against Napoleon.
Napoleon was imprisoned on islands because it was thought that it would be harder for him to escape from an island.
Elba and St. Helena.
The Battle of Guadalcanal.
The Cook Islands have never been in a war.
It probably protects against tsunamis
There is no special award, as many players have beaten all of the islands. You get the usual 100 credits awarded (50 for Haunted House and Dr. Hare's Secret Lab).
Guadalcanal.
Napoleon was exiled to two islands. First, in 1814, he was banned to Elba, an island right in front of the coast of Italy. Then, in 1815 after a short return to power, he was exiled to St Helena, an island near South Africa. Napoleon was banished to St. Helana in the South Atlantic.
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Britain fought against Argentina over the disputed possession of the Falkland islands.
He was first exiled to the Island of Elba in the Mediterranean Sea, but after returning to Europe, he was then exiled to the island of St. Helena in the South Atlantic.