The Great Depression.
The Reconstruction era began in 1865 and ended in 1877.
Racism continued and blacks still werent treated as equalls, but later on came Martin Luther and that era ended it all.
Slavery ended in the Reconstruction Era, thanks to the 13th Amendment.
Baby Boomers were born after WWII ended. That would be 1947 and after..
the invention of cotton gin by Eil Whitney in 1793
patents and copyrights
World War II.
The railroad system
No... The Holocaust ended before the era called the Cold War began.
The era that ended with Earth covered in massive deserts was the Permian period, specifically during the Permian-Triassic extinction event around 252 million years ago. This mass extinction event wiped out nearly 96% of marine species and 70% of terrestrial vertebrate species, leading to widespread desertification of the planet.
The Battle of Waterloo ended the Napoleonic era.
Extinction did.
An asteroid impact
Marble cake federalism emerged in the United States during the New Deal era, particularly in the 1930s. This period marked a shift from dual federalism, where state and federal responsibilities were clearly separated, to a more intertwined relationship between the two levels of government. The New Deal policies initiated by President Franklin D. Roosevelt led to increased cooperation and collaboration between state and federal authorities, creating a more blended approach to governance.
Improvement Era ended in 1970.
1930's era.
The Mesozoic Era ended about 66 million years ago with a mass extinction event, often attributed to a combination of volcanic activity, climate change, and a significant asteroid impact near the Yucatán Peninsula, known as the Chicxulub impact. This catastrophic event led to the extinction of approximately 75% of Earth's species, including the dinosaurs. The drastic environmental changes that followed paved the way for the rise of mammals and the eventual dominance of birds and flowering plants in the subsequent Cenozoic Era.