A New Republic by John Lukas, (2004)

Immigration of masses of people to United States was a determinant element in the character of the nature. In nineteen century huge numbers of people from British Isles, German, Scandinavia, Russia, Italy, Greek and other countries were immigrating to united stats. In the last years of nineteen century and in the First World War the rate of immigration grew.
Huge immigration had bilateral effects on Americans and immigrants.
Immigrants changed America; Immigration changed the religious and racial composition and America. One of the results of immigration was the transformation of American patriotism into nationalism. Immigration influenced the foreign policy. It Influenced on American life and culture from food to drink to music to movie industry. Even the pattern of Germanic education influenced American education.
America changed immigrants; the immigrants conformed to America and requirements of American life, they became Americanized. Americanization gave the exceptional pattern of behavior, speech and thought which made them different from non-Americans. Democratic nature of American system was something that immigrants found as an exceptional character of United States and tried to internalize that.
The influences of immigration on America and influences of America on immigrants made the nation with new men and women.

The two empires:
Until 1897 the British Empire was the greatest power in the earth. It was the largest empire in the history of the world. It had a quarter of the population of the world, it owned one fifth of all the land of globe, and its navy ruled most of the seas. British parliament, industry, sports, cloths, language were the most powerful ones the in glob. Those years were zenith of British power and British prestige.
During the years 1895 and 1898 between the relationship of Great Britain and the United States a revolution occurred. The alliance between United States and British in both world wars led to their victory and gradual abdication of the British Empire and continuing rise of American empire. The spirit of American imperialism was strengthening more and more. Eventually, by 1900 the idea of Pax Britannica replaced with the image of Pax Anglo-Americana.
The important point is the similarity of Great Britain and the United States. Americanization of the world was Anglicizing, somehow. English-speaking language and Protestantism were the most important elements that the two nations were in common.
On the other hand the conception of American and British Empire were different. While the dynamism and expansive sensation of the American empire were growing, the dynamism and expansion of British Empire began to decrease. The Americans were thinking about their manifest destiny while the British Empire was older than American one.
During the first decade of the new century England became more and more American. On one hand social distribution of power in both nations was the same and on the other hand their public culture was similar.
After the war in 1918 United States became the greatest power in the world. In fact the financial center of the world moved from London to New York. The president of the United States became a universally admired statesman of the world. In sum in the history of the United States the zenith of the American power was 1918. Another apogee of the United States power was in 1945.
By 1950 the democratic society moved to a bureaucratic one. It was bureaucracy that developed and institutionalized, that is why mass man replaced by organization man. Bureaucratization did not limited to government but a productive economy transited to an administrative economy. On the other hand all aspects of life including private lives were democratized.
Totally the nation which was created at the peak of the Modern Age became the representative of western civilization.