Was Chad renamed

No, Chad was not renamed.

Which colonizer gave independence to Chad and who was the prime Minister/president of the colonizer at that time

Chad gained independence from France on August 11, 1960. The President of France at that time was Charles de Gaulle. The first President of Chad after independence was François Tombalbaye.

Who was the Nationalist leader(s) and what was the political party(ies) called

One of the prominent nationalist leaders in Chad's struggle for independence was Gabriel Lisette, who founded the Chadian Progressive Party (PPT) in 1947. Another important nationalist leader was François Tombalbaye, who later became the first President of Chad. Tombalbaye was associated with the Chadian National Union (UNT) party.

What method was used to gain independence

The method used by Chad to gain independence from France was largely through political negotiations, peaceful protests, and diplomatic efforts. The Chadian nationalists and political leaders, such as Gabriel Lisette and François Tombalbaye, worked towards gaining independence through negotiations with the French colonial authorities and advocating for self-governance. While there were some instances of civil unrest and protests against French rule, Chad did not have a violent struggle for independence like some other African nations.