Many historians cite the following "documents" or better said, Acts of Congress, as measures that were at the time thought to be balanced compromises that eventually fell apart and led to sharp differences of opinion in the United States. They were the Missouri Compromise of 1820, and of 1850. The third Act was the Kansas - Nebraska Act. All of these were some sort of compromise to keep the Union whole.
As the great empires (Rome for example) fell apart, these smaller regions began to "find" themselves. This is never an easy process and took many years to accomplish. Slowly, nation-states began to form out of the chaos that was once a great empire.
when did the Cherokee nation began
The main issues that began to split the nation apart in the mid-1800s were primarily related to slavery, states' rights, and economic differences between the Northern and Southern states. The question of whether new states would allow slavery led to tension, along with disputes over the federal government's power and tariffs on goods. These underlying conflicts eventually culminated in the Civil War.
England
Greece
The supercontinent that began to break apart about 225 million years ago was Pangaea.
Poland
The French
After WW2 Europe was a war-torn continent, the economy was horrible, trade relation were in no good shape. A series of nation states were made, tearing countries apart, communism began to set in
Portuguese.
The crowning of Napoleon Bonaparte began the French nation. This happened after the French Revolution, which took place in the late 1700s. Bonaparte was crowned in 1802.
It began in the Kingdom of Judah, in the city of Jerusalem, in the modern nation-state of Israel.