Which of the following nations was not part of the British colonial empire?

Haiti is the correct answer because it was not part of the British colonial empire. Instead, Haiti was primarily colonized by the French and became the first independent nation in Latin America and the Caribbean after securing its independence from France in 1804. The other nations listed—Australia, India, and Nigeria—were all significant territories within the British Empire. Australia was claimed by Britain in 1788 and became a major British colony, India was a crown jewel of the British Empire from the 19th century until its independence in 1947, and Nigeria was incorporated into the British Empire through colonial conquests in the late 19th century. Thus, Haiti stands out as the only option that was never governed by British colonial rule.