The correct answer to this open question is the following.
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Yes, America has changed over time in many aspects. Unfortunately in others, not so much.
American society has changed in many ways since the English people arrived at Jamestown, Virginia, and founded the first colony in the North American territory. Then during American colonial times, the disputes with the Native American tribes marked the different approaches to the life of white American people and Native American Indians. So radically different.
Then, it came to the issue of slavery and racism. After the Emancipation Proclamation, Lincoln freed the slaves in the southern territories. ut as we know, even after the Union´s victory in the Civil War, Reconstruction was so different in the South. Southern people did the opposite and created legislation such as the Jim Crow laws and the black codes, that suppressed rights for the African Americans.
Then, it came the time of the 19th amendment and the right to a vote for women.
After two world wars and the Great Depression, the United States became one of the most powerful countries in the world. However, domestic issues continued. The issue of civil rights for African Americans and other minorities split the north and south again after so many years of differences.
Today, as we have witnessed recently, racism is still a big issue in America. Furthermore, political adversaries have increased the division between political ideologies in the country.