On May 7, 1915, a german submarine torpedoed and sank the Lusitania, a British cruiseliner which had 128 American citizens on board, as well as military goods. It was the first step to the US joining the war.
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Answer:
The North European Plain
Explanation:
The North European plain is the most populated region of the four mentioned in the question.
This was not always the case, and until the Middle Ages, the North European Plain was sparsely populated. However, ever since, its population has been growing, because despite having a climate that is wet and cool the majority of the year, the soil is very fertile, and the lack of physical geographical barriers makes it easier for human dwelling.
The rise of christianity in the Roman Empire was different to that of medieval Europe.
In the Roman Empire, christians were persecuted at the beginning and very slowly increased the amount of people who believed in their god. However, as time passed, more and more people identified themselves as belonging to the christian religion.
In medieval Europe on the other hand, christianity became popular much faster, as there was not that much opposition, compared to the times of Roman empire.
