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Yes, both have relations with the rest of the world.
capitalism and socialism
ethnic groups
The The Treaty of Versailles.
The Berlin Wall
The Entente Powers and the Central Powers.
The United Nations geoscheme is a scheme devised by the United Nations Statistics Division based on the M49 coding classification, which divides the world into macro-geographical regions and subregions.The geoscheme for Europe is divided into 4 groups: Eastern Europe, Northern Europe, Southern Europe and Western Europe. Western Europe consists of 9 countries: Austria, Belgium, France, Germany, Liechtenstein, Luxembourg, Monaco, Netherlands, and Luxembourg.Refer to link below for more information.
Europe is a melting pot of cultures. Europe itself is full of many native groups ranging from national groups (British, Russian, French, Greek, German, etc.) to regional groups (Celtic, Basque, Sicilian, Corsican, Scottish, etc.). Europe is also the number one immigration destination in the world. People from all over the world migrate to Europe, ranging from Americans to Brazilians to Kenyans to Japanese to Fijians. Almost every culture could be found in Europe at a large or small scale. This is why Europe is culturally diverse.
technically there can be over 100 groups of farmers their allover the world and china is one of the most farming countries ever so that's my answer :]
vagina
Secret alliances
well Europe had benefited from the war and changed their whole perspective about the other countries.