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The American islands that are actually an underwater chain of volcanoes are the Hawaiian Islands. These islands were formed by volcanic activity from the Hawaiian-Emperor seamount chain. The islands of Hawaii, Maui, Oahu, Kauai, and others are all part of this volcanic chain.
Hawaii.
Volcanic arcs form at plate subduction zones. Island arcs are volcanic islands that form over "hot spots" in the Earth's mantle. Because the islands are moving with the oceanic plate, they eventually are removed from the hot spot, forming a chain of islands in the direction of the plate movement.
The definition of the word island arc is " a curved chain of volcanic islands located at a tectonic plate margin, typically with a deep ocean trench on the convex side."
The Hawaiian chain consists of 137 islands, but only 6 main islands are typically included in maps and tourist itineraries: Hawaii (also known as the Big Island), Maui, Oahu, Kauai, Molokai, and Lanai.
The Aleutian Islands.
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A chain of 14 large volcanic islands and 55 smaller ones form the Aleutian Islands.
Aleutian Islands
If it is a single island, it is simply known as a volcanic island! If however it is a chain or string of separate islands then it may be a volcanic island arc (these form parallel to trenches at subduction zones) or a volcanic island chain (these form where a mantle plume creates a hotspot and may be in the centre of a tectonic plate. A good example would be the Hawaiian island chain). They can also form a cluster of islands (an archipelago) such as the Canary Islands (again formed by hotspot volcanism) in the Atlantic of the coast of Morocco.
The Aletian Islands.
Yes. Hawaii is a chain of volcanic islands.