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1450
Native american migration
Scientists have found that Native American populations - from Canada to the southern tip of Chile - arose from at least three migrations, with the majority descended entirely from a single group of First American migrants that crossed over through Beringia. -
1488
European colinization
Western colonialism, a political-economic phenomenon whereby various European nations explored, conquered, settled, and exploited large areas of the world. The age of modern colonialism began about 1500, following the European discoveries of a sea route around Africa's southern coast (1488) and of America (1492). -
1500
exploration
the period in European history in which extensive overseas exploration led by the Portuguese, emerged as a powerful factor in European culture, most notably the discovery of the Americas. -
revolution and independence
The Revolutionary War was an insurrection by American Patriots in the 13 colonies to British rule, resulting in American independence. -
constitution and republic
Benjamin Franklin, ever the optimist even at the age of 81, gave what was for him a remarkably restrained assessment in his final speech before the Constitutional Convention -
sectionalism and the age of reform
The years between 1820 and 1865 in the United States might be described as one long era of reform, marked by the predominant desire to purify individuals and society at large. By the 1850s sectionalism bitterly erupted over the issue of slavery and state's rights culminating in the American Civil War -
Civil war
The American Civil War was a civil war in the United States from 1861 to 1865, fought between northern states loyal to the Union and southern states that had seceded to form the Confederate States of America. -
reconstruction
America was being reformed after the American civil war took its toll. -
westward expansion
Westward expansion, the 19th-century movement of settlers into the American West, began with the Louisiana Purchase and was fueled by the Gold Rush. -
American Imperalism
American imperialism consists of policies aimed at extending the political, economic, and cultural influence of the United States over areas beyond its boundaries -
Nation building and expansion
Nation-building is constructing or structuring a national identity using the power of the state -
progressive era
The Progressive Era was a period of widespread social activism and political reform across the United States that spanned the 1890s to the 1920s. -
world war I
World War I was a global war that lasted from 28 July 1914 to 11 November 1918. -
roaring 20s
The Roaring Twenties was a time when many people defied Prohibition, indulged in new styles of dancing and dressing, and rejected many traditional moral standards. -
new era
New industries flourished, especially in the areas of electric power, automobiles, gasoline, tourist travel, and highway and housing construction. -
great depression
The Great Depression was a severe worldwide economic depression that took place mostly during the 1930s, beginning in the United States. -
World War II
World War II, also known as the Second World War, was a global war that lasted from 1939 to 1945. It involved the vast majority of the world's countries—including all the great powers—forming two opposing military alliances: the Allies and the Axis. -
postwar boom
a broad period of worldwide economic expansion beginning after World War II and ending with the 1973–1975 recession. -
cold war
The Cold War was a period of geopolitical tension between the Soviet Union and the United States and their respective allies, the Eastern Bloc and the Western Bloc, after World War II. -
Civil rights movement
The civil rights movement in the United States was a decades-long struggle by African Americans and their like-minded allies to end institutionalized racial discrimination, disenfranchisement and racial segregation in the United States. -
Vietnam war years
Conflict in Vietnam, Laos, and Cambodia from 1 November 1955 to the fall of Saigon on 30 April 1975. -
industrial age
The Industrial Age is a period of history that encompasses the changes in economic and social organization that began around 1760 in Great Britain and later in other countries. -
great society
The Great Society was a set of domestic programs in the United States launched by Democratic President Lyndon B. Johnson in 1964–65. -
science and technology era
It is an era of accelerated technological progress characterized by new innovations whose rapid application and diffusion typically cause an abrupt change in society. -
turmoil of the 70s
An era of economic struggle, cultural change and technological innovation. -
reagan and bush era
The following day, on July 17—the final day of the Republican National Convention—Reagan officially announced Bush as his running mate. -
Building the Bridge to the 21st Century
The Third Industrial Revolution which began around the 1950s continued into the late 20th century, and started to transition into Industry 4.0 and the Fourth Industrial Revolution in the beginning of the 21st century
