The United States in the context of "United States National Forest"

An American comic book is a thin periodical literary work originating in the United States, commonly between 24 and 64 pages, containing comics. While the form originated in 1933, American comic books first gained popularity after the 1938 publication of Action Comics, which included the debut of the superhero Superman. This was followed by a superhero boom that lasted until the end of World War II. After the war, while superheroes were marginalized, the comic book industry rapidly expanded and genres such as horror, crime, science fiction and romance became popular. The 1950s saw a gradual decline, due to a shift away from print media in the wake of television and the impact of the Comics Code Authority. The late 1950s and the 1960s saw a superhero revival and superheroes remained the dominant character archetype throughout the late 20th century into the 21st century.

Some fans collect comic books, helping drive up their value. Some have sold for more than US$1 million. Comic shops cater to fans, selling comic books, plastic sleeves ("bags") and cardboard backing ("boards") to protect the comic books.

The world's busiest airports by passenger traffic are measured by total passengers provided by the Airports Council International, defined as passengers enplaned plus passengers deplaned plus direct-transit passengers. The world's busiest airport is Hartsfield–Jackson Atlanta International Airport in metropolitan Atlanta, Georgia, which has been the world's busiest airport every year since 1998 with the exception of 2020, when its passenger traffic dipped for a year due to travel restrictions resulting from the COVID-19 pandemic. Atlanta regained the top position in 2021, and has held it since. Alternatively, London has the world's busiest city airport system by passenger count.

As of 2024, the United States has the most airports in the top 50 list, with 15 (16 in 2023), following by China having 12 (10 in 2023), while India and Spain have two. In terms of regions, North America has 17 airports in the top 50 (18 in 2023), followed by East Asia with 14 (12 in 2023), Europe with 8 (same as in 2023), Southeast Asia with 5 (6 in 2023), West Asia with three (same as 2023), South Asia with two (same as 2023), and South America with one (same as 2023).

In the United States, national forest is a classification of protected and managed federal lands that are largely forest and woodland areas. They are owned collectively by the American people through the federal government and managed by the United States Forest Service, a division of the United States Department of Agriculture. The U.S. Forest Service is also a forestry research organization that provides financial assistance to the state and local forestry industry. There are 154 national forests in the United States.

A shamrock is a type of clover, used as a symbol of Ireland. The word shamrock comes from Irish seamróg ([ˈʃamˠ.ɾˠoːɡ]), which is the diminutive of the Irish word seamair and simply means "young clover".

At most times, Shamrock refers to either the species Trifolium dubium (lesser/yellow clover, Irish: seamair bhuí) or Trifolium repens (white clover, Irish: seamair bhán). However, other three-leaved plants—such as Medicago lupulina, Trifolium pratense, and Oxalis acetosella—are sometimes called shamrocks. The shamrock was traditionally used for its medicinal properties, and was a popular motif in Victorian times.

After World War II, emigration restrictions were imposed by countries in the Eastern Bloc, which consisted of the Soviet Union and its satellite states in Central and Eastern Europe. Legal emigration was in most cases only possible to reunite families or to allow members of minority ethnic groups to return to their homelands.

Eastern Bloc governments argued that strict limits to emigration were necessary to prevent a brain drain. The United States and Western European governments argued that they represented a violation of human rights. Despite the restrictions, defections to the West occurred.