C. guaranteeing the full rights of U.S. citizenship for African Americans
The 14th amendment basically stated that anyone born in the U.S. would automatically be a U.S. citizen. That includes African Americans, regardless if they're a slave or not.
c.) the federal government gained the power to tax, which was something only the states had been allowed to do.
Answer: C. Citizens of individual states were also citizens of the United States.
The Articles of Confederation was an agreement between the thirteen colonies that served as the first constitution of the United States.
This passage establishes the right of all citizens of the individual states to enjoy full citizenship rights in all the other states of the union. However, it excludes paupers, vagabonds and fugitives of justice, as they do not enjoy the same rights as the general population even in their own colony.
c. United States bombing of Hiroshima and Nagasaki.