During world war 1, The Great Britain was known as the best naval army in the world. Germany know that they cannot face the British naval army on the surface, so they invested in more submarines to help them sustain the attack from sea.
Germany use the submarines mainly to destroy ships that deliver supplies for allied countries in order to weakened them. Even though eventually Germany still lost, without submarine the allied forces would destroyed them even faster.
Imperialism had fed into European tensions because of the high number of European countries competing for colonies all over the world.
Answer:
Because of the successful trade they had with the western side of Asia on the Silk Road.
Explanation:
