Dwight D. Eisenhower in the context of "United States in the Vietnam War"

The Republican Party, also known as the Grand Old Party (GOP), is a conservative and right-wing political party in the United States. It emerged as the main rival of the Democratic Party in the 1850s, and the two parties have dominated American politics since then.

The Republican Party was founded in 1854 by anti-slavery activists opposing the Kansas–Nebraska Act and the expansion of slavery into U.S. territories. It rapidly gained support in the North, drawing in former Whigs and Free Soilers. Abraham Lincoln's election in 1860 led to the secession of Southern states and the outbreak of the American Civil War. Under Lincoln and a Republican-controlled Congress, the party led efforts to preserve the Union, defeat the Confederacy, and abolish slavery. During the Reconstruction era, Republicans sought to extend civil rights protections to freedmen, but by the late 1870s the party shifted its focus toward business interests and industrial expansion. In the late 19th and early 20th centuries, it dominated national politics, promoting protective tariffs, infrastructure development, and laissez-faire economic policies, while navigating internal divisions between progressive and conservative factions. The party's support declined during the Great Depression, as the New Deal coalition reshaped American politics. Republicans returned to national power with the 1952 election of Dwight D. Eisenhower, whose moderate conservatism reflected a pragmatic acceptance of many New Deal-era programs.

The New Deal coalition was an American political coalition that supported the Democratic Party beginning in 1932. The coalition is named after President Franklin D. Roosevelt's New Deal programs, and the follow-up Democratic presidents. It was composed of voting blocs who supported them. The coalition included labor unions, blue-collar workers, big city machines, racial and religious minorities (especially Jews, Catholics, and African Americans), white Southerners, and intellectuals. Besides voters the coalition included powerful interest groups: Democratic Party organizations in most states, city machines, labor unions, some third parties, universities, and foundations. It was largely opposed by the Republican Party, the business community, and wealthy Protestants. In creating his coalition, Roosevelt was at first eager to include liberal Republicans and some radical third parties, even if it meant downplaying the "Democratic" name. By the 1940s, the Republican and third-party allies had mostly been defeated. In 1948, the Democratic Party stood alone and won both the White House and both congressional houses with a mandate, surviving the splits that created two splinter parties.

The coalition made the Democratic Party the majority party nationally for decades. From 1933 to 1968, Democrats only lost control of the White House when Republican Dwight D. Eisenhower was elected president in 1952 and was then reelected in 1956 due to his broad popularity. The Democrats typically controlled both Houses of Congress before the 1990s. The coalition began to weaken with the collapse of big city machines after 1940, the steady decline of labor unions after 1970, the bitter factionalism during the 1968 election, the turn of northern white ethnics and southern whites toward conservatism on racial issues, and the rise of neoliberalism under the presidency of Ronald Reagan, with its opposition to regulation.

Presidential elections were held in the United States on November 4, 1952. The Republican ticket of general Dwight D. Eisenhower and senator Richard Nixon defeated the Democratic ticket of Illinois Governor Adlai Stevenson II and senator John Sparkman in a landslide victory, becoming the first Republican president in 20 years. This was the first election since 1928 without an incumbent president on the ballot.

Stevenson emerged victorious on the third presidential ballot of the 1952 Democratic National Convention by defeating Tennessee Senator Estes Kefauver, Georgia Senator Richard Russell Jr., and other candidates. The Republican nomination was primarily contested by Eisenhower, a general, widely popular for his leadership in World War II, and the conservative Ohio Senator Robert A. Taft. With the support of Thomas E. Dewey and other party leaders, Eisenhower narrowly prevailed over Taft at the 1952 Republican National Convention. He selected youthful California Senator Richard Nixon as his running mate. In the first televised presidential campaign, Eisenhower was charismatic and very well known, in sharp contrast to Stevenson.

Richard Milhous Nixon (January 9, 1913 – April 22, 1994) was the 37th president of the United States, serving from 1969 until his resignation in 1974. A member of the Republican Party, he represented California in both houses of the United States Congress before serving as the 36th vice president under President Dwight D. Eisenhower from 1953 to 1961. His presidency saw the reduction of U.S. involvement in the Vietnam War, détente with the Soviet Union and China, the Apollo 11 Moon landing, and the establishment of the Environmental Protection Agency and Occupational Safety and Health Administration. Nixon's second term ended early when he became the only U.S. president to resign from office, as a result of the Watergate scandal.

Nixon was born into a poor family of Quakers in Yorba Linda, Southern California. He graduated from Whittier College with a Bachelor of Arts in 1934 and from Duke University School of Law with a Juris Doctor in 1937, practiced law in California, and then moved with his wife Pat to Washington, D.C., in 1942 to work for the federal government. After serving in the Naval Reserve during World War II, he was elected to the House of Representatives in 1946. His work on the Alger Hiss case established his reputation as a leading anti-communist. In 1950, he was elected to the Senate. Nixon was the running mate of Eisenhower, the Republican Party's presidential nominee in the 1952 and 1956 elections. Nixon served for eight years as vice president, and his two terms saw an increase in the notability of the office. He narrowly lost the 1960 presidential election to John F. Kennedy. After his loss in the 1962 race for governor of California, Nixon announced his retirement from politics. However, he ran again for the presidency in 1968 and defeated the Democratic candidate, Vice President Hubert Humphrey.

Matthew Bunker Ridgway (3 March 1895 – 26 July 1993) was a senior officer in the United States Army, who served as Supreme Allied Commander Europe (1952–1953) and the 19th Chief of Staff of the United States Army (1953–1955). Although he saw no combat service in World War I, he was intensively involved in World War II, where he was the first Commanding General (CG) of the 82nd Airborne Division, leading it in action in Sicily, Italy and Normandy, before taking command of the newly formed XVIII Airborne Corps in August 1944. He held the latter post until the end of the war in mid-1945, commanding the corps in the Battle of the Bulge, Operation Varsity and the Western Allied invasion of Germany.

Ridgway held several major commands after World War II and is most well-known for resurrecting the United Nations (UN) war effort during the Korean War. Several historians have credited Ridgway for turning the war around in favor of the UN side. He also persuaded President Dwight D. Eisenhower to refrain from direct military intervention in the First Indochina War to support French colonial forces, thereby essentially delaying the United States' Vietnam War by over a decade. He received the Presidential Medal of Freedom on 12 May 1986. Ridgway died in 1993 at the age of 98.

Project Vanguard was a program managed by the United States Navy Naval Research Laboratory (NRL), which intended to launch the first artificial satellite into low Earth orbit using a Vanguard rocket as the launch vehicle from Cape Canaveral Missile Annex, Florida.

In response to the launch of Sputnik 1 on 4 October 1957, the U.S. restarted the Explorer program, which had been proposed earlier by the Army Ballistic Missile Agency (ABMA). Privately, however, the Central Intelligence Agency (CIA) and President Dwight D. Eisenhower were aware of progress being made by the Soviets on Sputnik from secret spy plane imagery. Together with the Jet Propulsion Laboratory (JPL), ABMA built Explorer 1 and launched it on 1 February 1958 (UTC). Before work was completed, however, the Soviet Union launched a second satellite, Sputnik 2, on 3 November 1957. Meanwhile, the spectacular failure of Vanguard TV3 on 6 December 1957, deepened American dismay over the country's position in the Space Race.

The Apollo program, also known as Project Apollo, was the United States human spaceflight program led by NASA, which landed the first humans on the Moon in 1969. Apollo was conceived during Project Mercury and executed after Project Gemini. It was conceived in 1960 as a three-person spacecraft during the presidency of Dwight D. Eisenhower. Apollo was later dedicated to President John F. Kennedy's national goal for the 1960s of "landing a man on the Moon and returning him safely to the Earth" in an address to the U.S. Congress on May 25, 1961.

Kennedy's goal was accomplished on the Apollo 11 mission, when astronauts Neil Armstrong and Buzz Aldrin landed their Apollo Lunar Module (LM) on July 20, 1969, and walked on the lunar surface, while Michael Collins remained in lunar orbit in the command and service module (CSM), and all three landed safely on Earth in the Pacific Ocean on July 24. Five subsequent Apollo missions also landed astronauts on the Moon, the last, Apollo 17, in December 1972. In these six spaceflights, twelve people walked on the Moon.

Project Emily was the deployment of American-built Thor intermediate-range ballistic missiles (IRBMs) in the United Kingdom between 1959 and 1963. Royal Air Force (RAF) Bomber Command operated 60 Thor missiles, dispersed to 20 RAF air stations, as part of the British nuclear deterrent.

Due to concerns over the buildup of Soviet missiles, US President Dwight D. Eisenhower met Prime Minister Harold Macmillan in Bermuda in March 1957 to explore the possibility of short-term deployment of IRBMs in the United Kingdom until the long-range intercontinental ballistic missiles (ICBMs) were deployed. The October 1957 Sputnik crisis caused this plan to be expedited. The first Thor missile arrived in the UK on a Douglas C-124 Globemaster II transport aircraft in August 1958, and was delivered to the RAF in September.

The Dwight D. Eisenhower National System of Interstate and Defense Highways, commonly known as the Interstate Highway System, or the Eisenhower Interstate System, is a network of controlled-access highways that forms part of the National Highway System in the United States. The system extends throughout the contiguous United States and has routes in Hawaii, Alaska, and Puerto Rico.

In the 20th century, the United States Congress began funding roadways through the Federal Aid Road Act of 1916, and started an effort to construct a national road grid with the passage of the Federal Aid Highway Act of 1921. In 1926, the United States Numbered Highway System was established, creating the first national road numbering system for cross-country travel. The roads were funded and maintained by U.S. states, and there were few national standards for road design. United States Numbered Highways ranged from two-lane country roads to multi-lane freeways. After Dwight D. Eisenhower became president in 1953, his administration developed a proposal for an interstate highway system, eventually resulting in the enactment of the Federal-Aid Highway Act of 1956.