Which country's troops were responsible for the ultimate defeat of the Dahomey?

The ultimate defeat of the Dahomey Kingdom, located in what is now Benin, was chiefly the result of military engagements with France. In the late 19th century, French colonial ambitions led to conflicts with the Dahomey, culminating in confrontations during the Second Franco-Dahomean War which occurred between 1892 and 1894. The French troops were able to exploit the political disarray within Dahomey, as well as their superior military technology and tactics, leading to a decisive defeat of Dahomey forces.

France's involvement was part of its larger imperial strategy in West Africa, where it aimed to establish control over trade routes and resources. The defeat of the Dahomey marked a significant point in the colonization of the region, effectively ending the kingdom's autonomy and integrating it into the French colonial empire.

In contrast, the other options such as Germany, Britain, and Portugal, while involved in various colonial expansions in Africa, were not the primary military force responsible for the downfall of Dahomey. Their colonial interests in the region did not significantly intersect with the specific conflict that facilitated the Dahomey’s defeat by French forces.