Because they never knew when one of their family members would be sold to a separate place. They had no way to stop things from happening.
The Germans wanted the British government to ignore the Treaty of London and let the German army pass through Belgium. ... In the end, Britain refused to ignore the events of 4 August 1914, when Germany attacked France through Belgium. Within hours, Britain declared war on Germany.
Answer: Roman Confederation
Explanation:
The correct answer is D.
Many of the European countries involved in the era of imperialism had a large standing army. Countries like Great Britain and France had been around for centuries and built a strong military. The other three are all important factors that lead to the increase of imperialism in the 1800's.