War of Independence and birth of the nation
The American Revolutionary War (1775–1783), began as a war between the Kingdom of Great Britain and the Thirteen Colonies, but gradually grew into a world war between Britain on one side and the newly formed United States, France, Netherlands, Spain, and Mysore on the other. The main result was an American victory and European recognition of the independence of the United States, with mixed results for the other powers.
Constitution
The Constitution of the United States is the supreme law of the United States of America. The Constitution originally consisted of seven Articles. The first three Articles embody the doctrine of the separation of powers, whereby the federal government is divided into three branches: the legislature, consisting of the bicameral Congress; the executive, consisting of the President; and the judiciary, consisting of the Supreme Court and other federal courts. The fourth and sixth Articles frame the doctrine of federalism, describing the relationship between State and State, and between the several States and the federal government. The fifth Article provides the procedure for amending the Constitution. The seventh Article provides the procedure for ratifying the Constitution.
Separation of Powers
Separation of powers is a model for the governance of a state (or who controls the state). The model was first developed in Ancient Greece and Rome. Under this model, the state is divided into branches, each with separate and independent powers and areas of responsibility so that no branch has more power than the other branches. The normal division of branches is into a legislature, an executive, and a judiciary. The federal government is divided into three branches: the legislature, consisting of the bicameral Congress; the executive, consisting of the President; and the judiciary, consisting of the Supreme Court and other federal courts.
American Exceptionalism
American exceptionalism is the proposition that the United States is different from other countries in that it has a specific world mission to spread liberty and democracy.[2] It is not a notion that the United States is quantitatively better than other countries or that it has a superior culture, but rather that it is "qualitatively different".[3] In this view, America's exceptionalism stems from its emergence from a revolution.
Civil War
The American Civil War,), was a civil war fought from 1861 to 1865 between the United States (the "Union" or the "North") and several[3] Southern slave states that declared their secession and formed the Confederate States of America (the "Confederacy" or the "South"). The war had its origin in the fractious issue of slavery, especially the extension of slavery into the western territories.

Immigration
Immigration to the United States is a complex demographic phenomenon that has been a major source of population growth and cultural change throughout much of the history of the United States. The economic, social, and political aspects of immigration have caused controversy regarding ethnicity, economic benefits, jobs for non-immigrants, settlement patterns, impact on upward social mobility, crime, and voting behaviour.
New Deal
The New Deal was a series of domestic economic programs enacted in the United States between 1933 and 1936. They involved presidential executive orders or laws passed by Congress during the first term of President Franklin D. Roosevelt. The programs were in response to the Great Depression, and focused on what historians call the "3 Rs": Relief, Recovery, and Reform. That is Relief for the unemployed and poor; Recovery of the economy to normal levels; and Reform of the financial system to prevent a repeat depression.
World War 2
America in World War 2 covers the war against Japan, Germany and Italy starting with the 7 December 1941 attack on Pearl Harbour. During the first 2 years of the global conflict, the United States had