westernization (n.)

also westernisation, 1873, noun of action from westernize (v.). Earliest reference is to Japan.

[The mikado's] late rapid and radical progress in westernization (to evolve a word that the Japanese will need) justifies great expectations of him. [Coates Kinney, "Japanning the English Language," The Galaxy, July-Dec. 1873]

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Definitions of westernization from WordNet

Westernization (n.)
assimilation of Western culture; the social process of becoming familiar with or converting to the customs and practices of Western civilization;
Synonyms: Westernisation