explain American historical trends starting from the early 1900s

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As a nation the United States today is a product of its past. Trends or patterns with origins in earlier periods have shaped the political, economic, social and cultural life of our early 21st century society. Many of these trends can be traced back to the nations beginnings, but others developed or accelerated during the period since 1930. Choosing three (3) of these trends (patterns, tendencies) describe their development from their early period to the present, including their effects or impact. These trends may or may not follow a consistent pattern: some may grow steadily over time; others rise and fall at different times but move in the same direction. Note: a trend is a long range pattern developing over time; an event is a specific occurrence at a specific time.
For example,
1. The results of the election of 2016 are an event, the product of several trends.
2. Or, in the early 1900s there were three competing forms of automobile: gasoline engine, electric, steam. For several years it was not clear which would be most popular, but by 1910 clearly the gasoline powered automobile had established itself as the trend among the people who bought cars.
Dictionary definition of trend: a general direction or tendency.
Some themes or trends in US history: racial/ethnic conflict, quest for cheap labor, the impact of technological innovation, sexual \”liberation\”, etc
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