Gojoseon was an ancient Korean empire that was in present day China and North Korea.

The current nation of South Korea was formally proclaimed on August 15, 1948.

However, the founding of Korea itself began under the ancient kingdom known as Gojoseon, which was established in 2333 B.C.E.

It was called Gojoseon until 1897 when it became Korea. It was under Japanese rule from 1910 to 1945 and split into North and South Korea in 1948.

No, Gojoseon was founded in 2333 BC and lasted until 108 BC. Then came the Proto-Three Kingdoms era, then the Three Kingdoms, then Unified Silla & Balhae, then was split into 3 again, then came GORYEO (where the present day English name Korea comes from), then Joseon, then the Korean Empire, then the Japanese rule, Allied invasion of colonized Korea, and then finally the present day North & South Korea.

The Han dynasty, but it really wasn't much conquer or colonize (If i remember correctly from AP world). They just simply destroyed Gojoseon and placed 4 far flung military outposts (4 commandaries).

There are many important historical figures throughout the History of Korea. Determining which of them is the MOST important person is up to your personal opinion. Some of the most important Korean historical figures include, Dangun of Gojoseon (legendary founder of Gojoseon, the first Korean kingdom), Gwanggaeto the Great of Goguryeo (credited with making the Korean kingdom Goguryeo into a major Asian power), Wang Geon of Goryeo (credited with the founding of Goryeo as well as the complete unification of the Korean peninsula), King Sejong the Great of Joseon (credited with the creation of Hangul, the Korean alphabet, as well as the conquest of Tsushima and other regions), Admiral Yi Sun-Sin (savior of Joseon during the Imjin War and inventor of the ingenuous turtle ship), and Syngman Rhee and Kim Il-Sung (for dividing the Korean peninsula after 1300 years of unification).