There is not a specific antonym for diaspora, but the opposite of a diaspora would be the regrouping of a community or the coming together of a community. It could also be a renewal of a specific cultural group or ethnicity coming back together in a sort of revival of their culture.
Answer:
The piece of evidence that would best support the claim that "all new territories to the US should decide for themselves whether they will be slave or free" is the Compromise of 1850, that established the precedent that new territories would choose for themselves whether to be slave or free.
Explanation:
The Compromise of 1850 was an agreement between the different states of the United States regarding the status with which the different territories obtained after the war with Mexico would enter the Union. The question was whether these states would be free or slave, and how this would affect the balance between the two groups of states in Congress. Finally, through this agreement California was admitted as a free state, while Utah and New Mexico could define their status through popular sovereignty. The most important part of this agreement was the acceptance of popular sovereignty as the defining method of determining the status of the states against slavery. This would be applied again after the sanction of the Kansas-Nebraska Act, which would lead to a prelude to the Civil War in the event known as Bleeding Kansas.
Africans were the immigrants to the British New World that had no choice in their destinations or destinies. The first African Americans that arrived in Jamestown in 1619 on a Dutch trading ship were not slaves, nor were they free. They served time as indentured servants until their obligations were complete.
During the Gilded Age, 1876-1900, Congress was known for being rowdy and inefficient. It was not unusual to find that a quorum could not be achieved because too many members were drunk or otherwise preoccupied with extra-governmental affairs. The halls of Congress were filled with tobacco smoke, and spittoons were everywhere. One disgusted observer noted that not only did the members chew and spit incessantly, but their aim was bad. The atmosphere on the floor was described as an “infernal din.” The Senate, whose seats were often auctioned off to the highest bidder, was known as a “rich man's club,” where political favors were traded like horses, and the needs of the people in the working classes lay beyond the vision of those exalted legislators. The Senate dominated the federal government during the Gilded Age. Causing the world to react as if America wasn't under good control.
In other words, the world reacted as America wasn't mature.
Before the Revolution
France was a monarchy ruled by the king. The king had total power over the government and the people. The people of France were divided into three social classes called "estates." The First Estate was the clergy, the Second Estate was the nobles, and the Third Estate was the commoners. (google)