Why were tanks developed during world war i?

Match each treaty with its description. treatys- a the munich agreement b the pact of steel c the molotov-ribbentrop pact descriptions- 1- an alliance between germany and italy 2- an agreement between germany and the soviets dividing eastern europe 3-an agreement between germany, france, italy, and britain granting germany a small part of czechoslovakia in return for peace

The soviet union and the united states believed in two very different economic systems. what were the names of each?

Nationalism led to major conflicts following world war i, especially when: