Saint Domingue (which eventually became Haiti) was surrendered by the Spanish to the French after decades of fighting. Between 1700 to 1704 there were more than 100 sugar plantations. The French needed slaves to work in the plantations so they started bringing slaves from Africa. More than 10,000 slaves arrived in Haiti each year, and by the year 1787, the number increased to more than 40,000. There were nearly half a million slaves in Haiti by this time. The slaves outnumbered the free population by 10 to 1 so they began to organize. This led to the Haitian Revolution.
The period between 1870 and 1914 saw a Europe that was considerably more stable than that of previous decades. To a large extent this was the product of the formation of new states in Germany and Italy, and political reformations in older, established states, such as Britain and Austria. This internal stability, along with the technological advances of the industrial revolution, meant that European states were increasingly able and willing to pursue political power abroad.
Lincoln worried about resupplying fort Sumter because he thought it would provoke war (which it did), since the Southerners would view this as a federal intrusion.
Is wealth, often in kind, that a party gives to another as a sign of respect or, as was often the case in historical contexts, of submission or allegiance.