At the end of 19th century, the growth of Germany and its desire for a large colony brought up with a great tension. A new country with fast growth and a huge military base made European powers become very anxious. Arms races, conflict formed by alliance for countries themselves to defend themselves from other neighbored countries such as Germany brought European countries a war cloud hang over.
Imperialism is the biggest reason why European continents were so strict. Ambiance of Europe in the period is everyone looking for which colonies have left for them. This is equal for Germany, that admired to have colonies, but they had no colonies to go for, and everywhere to go out was blocked; Russia takes its East part, France and Spain takes its West, and Britain was dominating the ocean. So only way to go out and get some meat is to form an alliance.
So Germany, Austria-Hungary, and Italy formed an alliance of Triple Alliance in 1882. Then 1890, Otto Von Bismarck lost his power in 1890, Kaiser Wilhelm took all the authority in German politic. It made Germany locate in strong position in European diplomatic affair, but it wasn't successful. Kaiser's attitude of "Germany Dream" was having a colony that brought him to announce Germany has greatest amount of army, which is an aggressive policy. Kaiser Wilhelm II called it 'world policy (Welt politik)', aim of owning big colonial estate. He also brought up the campaign which calls for "Germany over everything," this inflamed the fuse of nationalism and this is one cause of European countries stressed by Germany's "World Policy".
The alliances with Kaiser Wilhelm's firm policy resulted more tension and threats. These international affairs such Moroccan Crisis (1905-1906), Bosnian Crisis (1908), and Agadir Crisis (July 1st, 1911) was the result...