Well,
The answer would be the number 3
why? because in the beginning when Ferdinand de Lesseps, a french engineer who built the swiss canal decided to create one in the isthmus of Panama due to its ideal location and width to save a lot of time and money on travels, they brought over from France workers and machines, used to create the swiss canal previously, but due to the clay soil and the tropical conditions they quickly broke, forcing workers to do most of the work manually.
Also, due to the heat and the still water, mosquitoes carrying different diseases like malaria and dengue, swarmed the area biting and infecting the workers, ultimately killing most.
Making them give up the whole project.
The Battle of El Alamein<span> marked the culmination of the North African campaign between the forces of the British Empire and the German-Italian army commanded in the field by Erwin Rommel in World </span>War<span> II.</span>
Most of the time in monarchies the rule is passed down through the bloodline, so my train of thought is feudalism.
The answer is he Unified China. Hope this helps!
