How did american popular culture change around the turn of the 20th century?

In British English the expression 'the turn of the nineteenth century' alludes to the years quickly going before and promptly following 1801, 'the turn of the twentieth century' to the years encompassing 1901, etc. In American English it isn't so clear cut.4  

There is no broad assention about what an expression like "turn of the nineteenth century" signifies. It seems to recommend the "transform of the nineteenth century into the twentieth"— i.e., the change from 1900 to 1901 (or, famously, 1899 to 1900).  

The United States experienced significant floods of movement amid the pioneer period, the initial segment of the nineteenth century and from the 1880s to 1920. Numerous workers came to America looking for more prominent financial chance, while a few, for example, the Pilgrims in the mid 1600s, landed looking for religious opportunity.

Around the 20th century, the American culture took a turn, the end of 19th to the 20th century was a period of modernization in America, the working class was growing and a new urban middle-class was created by industrialization especially on the Northern States. The US started to abandon the isolationist policy and started to become an economic and military power in the world, the American democracy became a model to other democracies, especially in Latin America.

Several immigrants moved to the US in that period, the country had a population growth that exploded major urban areas. The Industrial Revolution pushed the creation of big companies such as Ford, Standard Oil Company, States Steel Corporation, and Philip Morris. With the development of Railroads, now magazines, newspapers could travel long distances around the country. It also made easier to transport goods and food around the country. Production exploded and the US became more and more developed.

All of these factors made society and culture change deeply in America in that period.

a mogul empire was disbanded

lincoln declared that slavery should not be allowed to spread into the new states, and of course this angered the south at the time.