Why did the United States see nationalist movements as being related to communism?

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Explanation:

Contemporary European History covers the history of Eastern and Western Europe, including the United Kingdom, from 1918 to the present. By combining a wide geographical compass with a relatively short time span, the journal achieves both range and depth in its coverage. It is open to all forms of historical inquiry – including cultural, economic, international, political and social approaches – and welcomes comparative analysis. One issue per year explores a broad theme under the guidance of a guest editor. The journal regularly features contributions from scholars outside the Anglophone community and acts as a channel of communication between European historians throughout the continent and beyond it.

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a countries leader should be motivated by the common good of the country.