The United States became the world's leading industrial power in the early 20th century due to a surge in entrepreneurship and industrialization, as well as large numbers of immigrants. A national railroad network connected mines and factories across the country. Dissatisfaction with corruption and inefficiency led to the Progressive Era and reforms including the federal income tax, direct election of Senators, citizenship for Native Americans, prohibition, and women's suffrage. The U.S. entered World War I neutrally but later joined the Allies, and helped secure their victory. After economic prosperity in the 1920s, the Great Depression began with the 1929 stock market crash, and President Roosevelt introduced the New Deal with unemployment relief and other social programs. During
![The United States became the world's main industrial strength on the flip of the twentieth century,
because of an outburst of entrepreneurship and industrialization and the arrival of thousands and
thousands of immigrant people and farmers. A countrywide railroad network turned into completed and
big-scale mines and factories have been set up. Mass dissatisfaction with corruption, inefficiency, and
conventional politics inspired the Progressive movement, from the Nineties to the Nineteen Twenties,
main to reforms, along with the federal profits tax, direct election of Senators, granting of citizenship to
many indigenous humans, alcohol prohibition, and women's suffrage. Initially neutral at some stage in
World War I, america declared war on Germany in 1917 and funded the Allied victory the following yr.
After the wealthy Roaring Twenties, the Wall Street Crash of 1929 marked the onset of the decade-long
worldwide Great Depression. President Franklin D. Roosevelt applied his New Deal programs, inclusive
of comfort for the unemployed, aid for farmers, social protection, and a minimal wage. The New Deal
described present day American liberalism.[1] Following the Japanese assault on Pearl Harbor, america
entered World War II and financed the Allied conflict attempt, and helped defeat Nazi Germany and
Fascist Italy within the European theater. Its involvement culminated in the usage of newly American
invented nuclear guns on Hiroshima and Nagasaki to defeat Imperial Japan inside the Pacific War.](https://image.slidesharecdn.com/4-221227104825-d1010a46/85/4-docx-1-320.jpg)