They contributed to World War 1 through the assassination of Archduke Franz Ferdinand. The Black Hand was part of a Pan-Slavist movement in which they wanted to unite territories of South Slave that had been annexed by Austria-Hungry. Hopefully this helps.
The rise of corporations after 1865 was partially caused by the rising and booming capitalism which saw that very large structures and companies needed a different way of self-organization. For that reason organizations emerged as natural entities.
New slaves from Africa were imported in Southern plantations.
What could cause you to lose your citizenship of a certain country would be if you decided to betray your country for some reason in some way. This could be done in multiple fashions, one being if you're in the army and you give out a top military secret. This cold make you lose citizenship.