The Bald Eagle (Symbol)
Perhaps the most famous symbol of America, the Bald Eagle was chosen to be included on the official seal of the United States (among other things) because of its long-life, tremendous strength, majestic looks, and because, at the time, it was believed to only exist in North America. Also, the Bald Eagle represents freedom, freedom which the Revolutionary War was fought over.
In other words, the Bald Eagle represents the values of America.
Rosie the Riveter (Symbol)
"We Can Do It" the most famous Rosie the Riveter image read. Rosie the Riveter is a cultural icon of WWII.
Rosie the Riveter symbolized the women who worked during WWII while the men were in Europe and the Pacific fighting Axis aggression. It was meant to empower women and is also a symbol of American feminism and women's economic advantage.
If given the opportunity to name a few iconic images of World War II, Rosie the Riveter would be among the image of the flag raising at Iwo Jima. Hitler at the Eiffel Tower, the Soviet Flag flying over the Reichstag in Berlin, the picture inside a D-Day landing craft, and even the picture of the famous kiss in Time's Square, New York.
The Statue of Liberty (Symbol)
Gifted by the French to America as a token of appreciation for the two countries friendship, the Statue of Libery is one of the most powerful symbols in the world. Broadly, it symbolizes the freedom that is omnipresent in America but mostly absent across the world. It also symbolizes liberty (as the name would suggest) and hope (immigrants from the Old World would first see the Statue when they arrived at Ellis Island).
The White House (Symbol)
The White House is the primary residence of the American President and his family. Created by Irish-born architect James Hoban and first inhabited by Thomas Jefferson, it symbolizes American strength, perseverance, history, and the American people themselves.
American Interventionism (Motif)
Throughout history, America intervened in events and wars around the world. U.S. intervention has its roots in the 19th century, including intervention in Chile, in the Texas rebellion, in China, and in the Spanish-American Civil War, for example.
In the 20th century, America was involved in Latin America, China (again), the Philippines, Mexico, Haiti, World War I, World War II, Korea, the Cold War (and all of the proxy wars et. al), and in the Middle East.
In the 21st century, America was involved primarily in the Middle East, but in other areas of the world.