The Portuguese trading empire fell apart by 1500 because Portugal was a small country with few resources. (option c)
As a result of having a small population, Portugal failed to effectively defend its overstretched network of trading post, so that the empire began to decline gradually and for a long time.
Hey the answer is trench warfare. presuming you're talking about when they fought in trenches across no mans land. hope this helps, have an amazing day :)
