Austria declared war on Serbia in a calculated response to the murder of Archduke Franz Ferdinand. There was much blame on both sides as to why war came about and what the true cause was, but the murder was the reason used.
For people to be free, so they themselves have equal rights.
I believe meritocracy is the system you’re looking for.
Ex. Civil Service Exam
B. is the answer you will want to put. While they did let African Americans fight in the war in a special unit, they would not allow that unit to be led by an African American. It was headed by a white man named Robert Gould Shaw.
The space invaders is the answer