For the last 32 million years the Pacific
has moved in a northwestern direction over the Hawai'i Hotspot
in the seafloor.
The islands to the north are thus the oldest
and have ceased volcanic activity long time ago. The Haleakala volcano on Maui is dormant and only the southernmost island, Hawai'i,
still has some very active volcanoes incuding flowing lava.
Southeast from here a new island called Lo'ihi
is in the
making. Just wait another 10.000 years...
About 2000 years ago Polynesians from the Marquesas Islands
started to settle the Hawaiian
Islands and population grew steadily.
It was overtrown in 1893 with help of the USA which subsequently annexed the islands in 1898.
The Hawaiin Islands joined
the USA as the 50th and sofar last state in 1959.