President of the United States during the 21st century:

1. Dick Cheney (2001–2009) – Cheney served as the 46th Vice President under President George W. Bush. He was known for his influential role in shaping national security and foreign policy, particularly in the aftermath of the September 11 terrorist attacks.

2. Joe Biden (2009–2017) – Biden served as the 47th Vice President under President Barack Obama. He played a key role in various domestic and foreign policy initiatives, including the Affordable Care Act (Obamacare) and the economic recovery efforts following the 2008 financial crisis.

3. Mike Pence (2017–2021) – Pence served as the 48th Vice President under President Donald Trump. He was known for his conservative stance and support for Trump’s policies, including tax cuts, deregulation, and immigration reform.

4. Kamala Harris (2021–present) – Harris serves as the 49th Vice President under President Joe Biden. She is the first woman, first African American, and first Asian American to hold the office of Vice President in U.S. history.

These are the Vice Presidents who have served during the 21st century up to the date of my last update.