European countries established colonies throughout the world, mostly in America and Africa, from the 1400s up till the early 1900s. After WWI and WWII, international boundaries changed. They mainly focused on balancing power. After WWI, the country fell under the power of the Soviet Union. Once the Soviet Union took over, conflicts emerged between the people living in the state.
it caused the downfall of 4 monarchies which were russia, turkey, germany & austria-hungary it created many new nation states. forced the us to become a world power and they lost $186 billion dollars
