A civil war is a war between organized groups within the same nation state or republic, or, less commonly, between two countries created from a formerly united nation state. The aim of one side may be to take control of the country or a region, to achieve independence for a region, or to change government policies. The term is a calque of the Latin bellum civile which was used to refer to the various civil wars of the Roman Republic in the 1st century BC.

A civil war is a high-intensity conflict, often involving regular armed forces, that is sustained, organized and large-scale. Civil wars may result in large numbers of casualties and the consumption of significant resources.

Civil wars since the end of World War II have lasted on average just over four years, a dramatic rise from the one-and-a-half year average of the 1900-1944 period. While the rate of emergence of new civil wars has been relatively steady since the mid-19th century, the increasing length of those wars resulted in increasing numbers of wars ongoing at any one time. For example, there were no more than five civil wars underway simultaneously in the first half of the 20th century, while over 20 concurrent civil wars were occurring at the end of the Cold War, before a significant decrease as conflicts strongly associated with the superpower rivalry came to an end. Since 1945, civil wars have resulted in the deaths of over 25 million people, as well as the forced displacement of millions more. Civil wars have further resulted in economic collapse; Burma (Myanmar), Uganda and Angola are examples of nations that were considered to have promising futures before being engulfed in civil wars.

Kenneth Lauren "Ken" Burns (born July 29, 1953) is an American director and producer of documentary films, known for his style of using archival footage and photographs. Among his productions are The Civil War (1990), Baseball (1994), Jazz (2001), The War (2007), The National Parks: America's Best Idea (2009) and Prohibition (2011).

Burns' documentaries have been nominated for two Academy Awards, and have won Emmy Awards, among other honors.

Ken Burns was born in 1953 in Brooklyn, New York City, New York, according to his official website, though some sources give Ann Arbor, Michigan, and some, including The New York Times, give both Brooklyn and Ann Arbor. The son of Lyla Smith (née Tupper) Burns, a biotechnician, and Robert Kyle Burns, at the time a graduate student in cultural anthropology at Columbia University, in Manhattan. Ken Burns' brother is the documentary filmmaker Ric Burns.

Burns' academic family moved frequently, and lived in Saint-Véran, France; Newark, Delaware; and Ann Arbor, where his father taught at the University of Michigan. Burns' mother was diagnosed with breast cancer when Burns was 3, and died when he was 11, a circumstance that he said helped shape his career; he credited his father-in-law, a psychologist, with a signal insight: "He told me that my whole work was an attempt to make people long gone come back alive.". Well-read as a child, he absorbed the family encyclopedia, preferring history to fiction. Upon receiving an 8 mm film movie camera for his 17th birthday, he shot a documentary about an Ann Arbor factory. Turning down reduced tuition at the University of Michigan, he attended the new Hampshire College, an alternative school in Amherst, Massachusetts with narrative evaluations rather than letter grades and self-directed academic concentrations instead of traditional majors. He worked in a record store to pay his tuition.

Captain America is a fictional character, a superhero who appears in comic books published by Marvel Comics. The character first appeared in Captain America Comics #1 (cover-dated March 1941), from Marvel Comics' 1940s predecessor, Timely Comics, and was created by Joe Simon and Jack Kirby. As of 2007, an estimated 210 million copies of "Captain America" comic books had been sold in 75 countries. For nearly all of the character's publication history, Captain America was the alter ego of Steve Rogers, a frail young man who was enhanced to the peak of human perfection by an experimental serum in order to aid the United States war effort. Captain America wears a costume that bears an American flag motif, and is armed with an indestructible shield that can be thrown as a weapon.

An intentionally patriotic creation who was often depicted fighting the Axis powers of World War II, Captain America was Timely Comics' most popular character during the wartime period. After the war ended, the character's popularity waned and he disappeared by the 1950s aside from an ill-fated revival in 1953. Captain America was reintroduced during the Silver Age of comics when he was revived from suspended animation by the superhero team the Avengers in The Avengers #4 (March 1964). Since then, Captain America has often led the team, as well as starring in his own series.