This political unit is French Guiana. It is an overseas department of France.
French Guinea became the Republic of Guinea in 1958. France has no authority over the Republic of Guinea.
France has sovereignty over French Guiana. It is an overseas French department.
I smell homework. French guinia.
France has sovereignty over French Guiana. It is an overseas French department.
which has emerged as the worlds main political unit
French Guiana is an overseas department of France, making it the only large political unit in South America that is not an independent country. Its governance and sovereignty fall under the responsibility of France.
You are referring to French Guiana (or Guyane). It is an overseas department of France.
which has emerged as the worlds main political unit
This question likely has no exact answer since no unit has emerged as a primary world political unit, but the closest existing institution to that is likely the United Nations. The state
Brazil has sovereignty over the largest political unit in South America (and that political unit is the nation of Brazil).
A political unit is a group of people that join together in support of a series of political views. Often times a political unit is formed to support a political party during an election.