Social Security retirement benefits.
Answer:
Former name: Czechoslovakia.
Now the 2 countries are Slovakia and the Czech Republic.
Explanation:
To reward settlers for their service to the Crown, Spain established the encomienda system. It gave settlers the right to tax local Native Americans or to make them work. In exchange, these settlers were supposed to protect the Native American people and convert them to Christianity.
D. A frame is a list of the individuals in the population being studied.