Sandra Day O'Connor (born March 26, 1930) is an American retired attorney and politician who served as the first female associate justice of the Supreme Court of the United States from 1981 to 2006. She was both the first woman nominated and the first confirmed to the court. Nominated by President Ronald Reagan, she was considered the swing vote for the Rehnquist Court and the first few months of the Roberts Court.

Prior to O'Connor's tenure on the Court, she was a judge and an elected official in Arizona, serving as the first female majority leader of a state senate as the Republican leader in the Arizona Senate. Upon her nomination to the Court, O'Connor was confirmed unanimously by the Senate. On July 1, 2005, she announced her intention to retire effective upon the confirmation of a successor. Samuel Alito was nominated to take her seat in October 2005 and joined the Court on January 31, 2006.

O'Connor most frequently sided with the Court's conservative bloc. She often wrote concurring opinions that sought to limit the reach of the majority holding. Her majority opinions in landmark cases include Grutter v. Bollinger and Hamdi v. Rumsfeld. She also wrote in part the per curiam majority opinion in Bush v. Gore, and was one of three co-authors of the lead opinion in Planned Parenthood v. Casey.

During her time on the Court, some publications ranked O'Connor among the most powerful women in the world. Upon leaving the Court, she succeeded Henry Kissinger as Chancellor of the College of William and Mary. On August 12, 2009, she was awarded the Presidential Medal of Freedom by President Barack Obama.

The president of the United States (POTUS) is the head of state and head of government of the United States of America. The president directs the executive branch of the federal government and is the commander-in-chief of the United States Armed Forces.

The power of the presidency has grown substantially since the office's establishment in 1789. While presidential power has ebbed and flowed over time, the presidency has played an increasingly strong role in American political life since the beginning of the 20th century, with a notable expansion during the presidency of Franklin D. Roosevelt. In contemporary times, the president is also looked upon as one of the world's most powerful political figures as the leader of the only remaining global superpower. As the leader of the nation with the largest economy by nominal GDP, the president possesses significant domestic and international hard and soft power.

Article II of the Constitution establishes the executive branch of the federal government and vests the executive power in the president. The power includes the execution and enforcement of federal law and the responsibility to appoint federal executive, diplomatic, regulatory, and judicial officers. Based on constitutional provisions empowering the president to appoint and receive ambassadors and conclude treaties with foreign powers, and on subsequent laws enacted by Congress, the modern presidency has primary responsibility for conducting U.S. foreign policy. The role includes responsibility for directing the world's most expensive military, which has the second largest nuclear arsenal.

The president also plays a leading role in federal legislation and domestic policymaking. As part of the system of checks and balances, Article I, Section 7 of the Constitution gives the president the power to sign or veto federal legislation. Since modern presidents are also typically viewed as the leaders of their political parties, major policymaking is significantly shaped by the outcome of presidential elections, with presidents taking an active role in promoting their policy priorities to members of Congress who are often electorally dependent on the president. In recent decades, presidents have also made increasing use of executive orders, agency regulations, and judicial appointments to shape domestic policy.

The president is elected indirectly through the Electoral College to a four-year term, along with the vice president. Under the Twenty-second Amendment, ratified in 1951, no person who has been elected to two presidential terms may be elected to a third. In addition, nine vice presidents have become president by virtue of a president's intra-term death or resignation. In all, 45 individuals have served 46 presidencies spanning 58 full four-year terms.Joe Biden is the 46th and current president of the United States, having assumed office on January 20, 2021.