The most accurate response is:
The addition of new amendments to the Constitution has taken place slowly over many decades.
Throughout U.S. history, the process of enfranchising more people has involved a gradual and often contentious series of constitutional amendments, legislation, and social movements. Key amendments, such as the 15th (1870), 19th (1920), 24th (1964), and 26th (1971), have expanded voting rights, but this process has taken significant time and effort, reflecting the complexities of societal change and resistance to enfranchisement.