Final answer:
America has experienced changes in areas like economy, politics, culture, and social issues. Challenges faced by American society have been addressed by reformers, and federalism has evolved over time.
Step-by-step explanation:
America has undergone significant changes over time in various aspects such as economy, politics, culture, and social issues. For example, the economy has transitioned from an agrarian society to an industrial society and now to an information and technology-driven society. In politics, race, gender, and social status have had an impact on American politics. American society has faced numerous challenges, and reformers have sought to address these challenges with specific goals in mind. The concept of federalism, the distribution of power and responsibility between the federal and state governments, has also evolved over time.