How long has the U.S. Constitution been in use?

The U.S. Constitution has been in use since it was ratified in 1788, making it over two centuries old. Specifically, as of October 2023, it has been in effect for 235 years. This enduring document has served as the foundational framework for the federal government and has been the subject of various amendments, interpretations, and judicial reviews throughout its history.

Considering the provided options, the choice indicating over two centuries accurately reflects the Constitution's long-standing role in American governance. The other choices, which suggest a duration of less than fifty years, less than two decades, or just one century, do not align with the historical timeline and significance of the Constitution. This highlights the importance of recognizing the enduring principles and the continued relevance of the Constitution in guiding the United States' legal and political systems.