Europe is very difficult from the USA because Europe has many cultures and Nations that have existed for thousands of years

With the English, Germans and Franch being great examples

For the USA its cultural origins is English and with the British wining domination in the North American continent after the seven years War in the 1750s and early 1760s

Meant the 13 colonies then the United States of America after the American War of independence could expand to the Pacific

With no rivals also new technologies such as the railways, telegraph and other new technologies such as the radio

Meant the United States would stay unite it as a political and cultural entity

For Europe from 1500 to 1945 was fighting an historical equivalent to the Chinese Waring state's period

To see which power would come to rule all of Europe