Final answer:
During the hundred years between America's independence and the coming of the 1900s, the United States experienced significant changes. These changes included the Industrial Revolution, westward expansion, the growth of railroads, the abolition of slavery, and the formation of natural parks.
Step-by-step explanation:
During the hundred years between America's independence and the coming of the 1900s, the United States experienced significant changes in various aspects. One major change was the Industrial Revolution, which led to increased productivity and technology advancements in all areas. This period also saw the expansion of the country westward through events like the Louisiana Purchase, the displacement of Native American tribes, the growth of railroads, the discovery of mineral wealth, the abolition of slavery, and the formation of natural parks.