What was the only African nation to officially fight in WWI?

Here is the question :

WHAT WAS THE ONLY AFRICAN NATION TO OFFICIALLY FIGHT IN WWI?

Here is the option for the question :

• Liberia
• Ivory Coast
• Egypt
• South Africa

The Answer:

And, the answer for the the question is :

Explanation:

[STC0012023]. Liberia was the only African nation to participate in World War I as an independent nation. The United States, a close friend of the western African nation, formally entered the war that year as well.