I believe his separation of powers theory was the foundation for the U.S. Constitution. Not sure how long it was included but that's all I know.
Andrew Jackson. The Manifest Destiny, being the goal of reaching "sea to shining sea," was a major goal for this president. He was the president who initiated the Lewis and Clarke expedition. Drop a thanks if this helped !
I think the answer is that The 1850s was a pivotal decade in the 19th century. In the United States, tensions over slavery became prominent and events began to put the nation on the road to civil war. In Europe, new technology was celebrated and the great powers fought the Crimean War.