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The Strauss–Howe generational theory, also known as the Fourth Turning theory or simply the Fourth Turning, which was created by authors William Strauss and Neil Howe, describes a theorized recurring generation cycle in American history. According to the theory, historical events are associated with recurring generational personas (archetypes). Each generational persona unleashes a new era (called a turning) lasting around 20–22 years, in which a new social, political, and economic climate exists. They are part of a larger cyclical "saeculum" (a long human life, which usually spans between 80 and 90 years, although some saecula have lasted longer). The theory states that after every saeculum, a crisis recurs in American history, which is followed by a recovery (high). During this recovery, institutions and communitarian values are strong. Ultimately, succeeding generational archetypes attack and weaken institutions in the name of autonomy and individualism, which ultimately creates a tumultuous political environment that ripens conditions for another crisis.

Strauss and Howe laid the groundwork for their theory in their 1991 book Generations, which discusses the history of the United States as a series of generational biographies going back to 1584. In their 1997 book The Fourth Turning, the authors expanded the theory to focus on a fourfold cycle of generational types and recurring mood eras to describe the history of the United States, including the Thirteen Colonies and their British antecedents. However, the authors have also examined generational trends elsewhere in the world and described similar cycles in several developed countries.

Academic response to the theory has been mixed—some applauding Strauss and Howe for their "bold and imaginative thesis" and others criticizing the theory as being overly-deterministic, non-falsifiable, and unsupported by rigorous evidence, "about as scientific as astrology or a Nostradamus text." Strauss–Howe generational theory has also been described by some historians and journalists as a "pseudoscience" "kooky", and "an elaborate historical horoscope that will never withstand scholarly scrutiny."

Academic criticism has focused on the lack of rigorous empirical evidence for their claims, and the authors' view that generational groupings are far more powerful than other social groupings such as economic class, race, sex, religion and political parties.

Gödel's Loophole is a "inner contradiction" in the Constitution of the United States which Austrian-German-American logician, mathematician, and analytic philosopher Kurt Gödel claimed to have discovered in 1947. The flaw would have allowed the American democracy to be legally turned into a dictatorship. Gödel told his friend Oskar Morgenstern about the existence of the flaw and Morgenstern told Albert Einstein about it at the time, but Morgenstern, in his recollection of the incident in 1971, never mentioned the exact problem as Gödel saw it. This has led to speculation about the precise nature of what has come to be called "Gödel's Loophole". It has been called "one of the great unsolved problems of constitutional law."

United States involvement in regime change describes United States government participation or interference, both overt and covert, in the replacement of foreign governments. In the latter half of the 19th century, the U.S. government initiated actions for regime change mainly in Latin America and the southwest Pacific, including the Spanish–American and Philippine–American wars. At the onset of the 20th century, the United States shaped or installed governments in many countries around the world, including neighbors Panama, Honduras, Nicaragua, Mexico, Haiti, and the Dominican Republic.

During World War II, the United States helped overthrow many Nazi Germany or imperial Japanese puppet regimes. Examples include regimes in the Philippines, Korea, the Eastern portion of China, and much of Europe. United States forces were also instrumental in ending the rule of Adolf Hitler over Germany and of Benito Mussolini over Italy. After World War II, the United States in 1945 ratified the UN Charter, the preeminent international law document, which legally bound the U.S. government to the Charter's provisions, including Article 2(4), which prohibits the threat or use of force in international relations, except in very limited circumstances. Therefore, any legal claim advanced to justify regime change by a foreign power carries a particularly heavy burden.

In the aftermath of World War II, the U.S. government struggled with the Soviet Union for global leadership, influence and security within the context of the Cold War. Under the Eisenhower administration, the U.S. government feared that national security would be compromised by governments propped by the Soviet Union's own involvement in regime change and promoted the domino theory, with later presidents following Eisenhower's precedent. Subsequently, the United States expanded the geographic scope of its actions beyond traditional area of operations, Central America and the Caribbean. Significant operations included the United States and United Kingdom-orchestrated 1953 Iranian coup d'état, the 1961 Bay of Pigs Invasion targeting Cuba, and support for the overthrow of Sukarno by General Suharto in Indonesia. In addition, the U.S. has interfered in the national elections of countries, including the Philippines in 1953, and Japan in the 1950s and 1960s as well as Lebanon in 1957. According to one study, the U.S. performed at least 81 overt and covert known interventions in foreign elections during the period 1946–2000. Another study found that the U.S. engaged in 64 covert and six overt attempts at regime change during the Cold War.

Following the dissolution of the Soviet Union, the United States has led or supported wars to determine the governance of a number of countries. Stated U.S. aims in these conflicts have included fighting the War on Terror, as in the ongoing Afghan war, or removing dictatorial and hostile regimes, as in the Iraq War.

This chronological list of school shootings in the United States includes any school shootings that occurred at a K-12 public or private school, as well as at colleges and universities, and on school buses. Excluded from this list are the following:

1. Incidents that occurred during wars
2. Incidents that occurred as a result of police actions
3. Murder-suicides by rejected suitors or estranged spouses
4. Suicides or suicide attempts involving only one person.

Shootings by school staff, where the only victims are other employees, are covered at workplace killings.

This is a list of shootings in the United States that have occurred in 2022. Mass shootings are incidents involving several victims of firearm-related violence. The precise inclusion criteria are disputed, and there is no broadly accepted definition.

Gun Violence Archive, a nonprofit research group, run by Tracy Holtan, that tracks shootings and their characteristics in the United States, defines a mass shooting as an incident in which four or more people, excluding the perpetrator(s), are shot in one location at roughly the same time. The Congressional Research Service narrows that definition, limiting it to "public mass shootings", defined by four or more victims killed, excluding any victims who survive. The Washington Post and Mother Jones use similar definitions, with the latter acknowledging that their definition "is a conservative measure of the problem", as many shootings with fewer fatalities occur. The crowdsourced Mass Shooting Tracker project has the most expansive definition of four or more shot in any incident, including the perpetrator in the victim inclusion criteria.

A 2019 study of mass shootings published in the journal Injury Epidemiology recommended developing "a standard definition that considers both fatalities and nonfatalities to most appropriately convey the burden of mass shootings on gun violence." The authors of the study further suggested that "the definition of mass shooting should be four or more people, excluding the shooter, who are shot in a single event regardless of the motive, setting or number of deaths."

A Red Scare is the promotion of a widespread fear of a potential rise of communism, anarchism or other leftist ideologies by a society or state. The term is most often used to refer to two periods in the history of the United States which are referred to by this name. The First Red Scare, which occurred immediately after World War I, revolved around a perceived threat from the American labor movement, anarchist revolution, and political radicalism. The Second Red Scare, which occurred immediately after World War II, was preoccupied with the perception that national or foreign communists were infiltrating or subverting American society and the federal government. The name refers to the red flag as a common symbol of communism.

Pinkerton is a private security guard and detective agency established around 1850 in the United States by Scottish-born American cooper Allan Pinkerton and Chicago attorney Edward Rucker as the North-Western Police Agency, which later became Pinkerton & Co, and finally the Pinkerton National Detective Agency. It is currently a subsidiary of Swedish-based Securitas AB. Pinkerton became famous when he claimed to have foiled the Baltimore Plot to assassinate president-elect Abraham Lincoln in 1861. Lincoln later hired Pinkerton agents to conduct espionage against the Confederacy and act as his personal security during the American Civil War.

The Pinkerton National Detective Agency hired women and minorities from its founding because they were useful as spies, a practice uncommon at the time. At the height of their power, the Pinkerton Detective Agency was the largest private law enforcement organization in the world.

Following the Civil War, the Pinkertons began conducting operations against organized labor. During the labor strikes of the late 19th and early 20th centuries, businesses hired the Pinkerton Agency to infiltrate unions, supply guards, keep strikers and suspected unionists out of factories, and recruit goon squads to intimidate workers. During the Homestead Strike of 1892, Pinkerton agents were called in to reinforce the strikebreaking measures of industrialist Henry Clay Frick, who was acting on behalf of Andrew Carnegie, the head of Carnegie Steel. Tensions between the workers and strikebreakers erupted into violence which led to the deaths of three Pinkerton agents and nine steelworkers. During the late nineteenth century, the Pinkertons were also hired as guards in coal, iron, and lumber disputes in Illinois, Michigan, New York, Pennsylvania, and West Virginia. Pinkertons were also involved in other strikes such as the Great Railroad Strike of 1877.

During the 20th century, Pinkerton rebranded itself into a personal security and risk management firm. The company has continued to exist in various forms through to the present day, and is now a division of the Swedish security company Securitas AB, operating as "Pinkerton Consulting & Investigations, Inc. d.b.a. Pinkerton Corporate Risk Management". The former Government Services division, PGS, now operates as "Securitas Critical Infrastructure Services, Inc.".