What are the reasons for the deepening contradictions between the great powers in the late 19th and early

What are the reasons for the deepening contradictions between the great powers in the late 19th and early 20th centuries? For what purpose were the first military-political groups created? How did German policy in Britain resonate? What worried the British the most?

1. Colonial redistribution of the world, strengthening of Germany in terms of the fleet, army and economy (the first economy of continental Europe).

2. In order to maintain the balance of power in Europe. Italy and Austria-Hungary were Germany’s allies, and France and Russia opposed them (the treaty of 1893).

3. The policy of Germany caused hostility, the countries competed everywhere (for example, the Germans supported the Boers in 1899-1902, when they fought with England).

4. Strengthening the German fleet. The British were strong at sea, but weak in terms of the land army.