Answer: Political scientist
Explanation:
Political scientist is the person who studies beginning, development, trend and function of any political system as a finding or research.This study is based on studying political regulation, operations, government policies,political history etc.
According to the question, David should contact political scientist for gaining information about highest expected age-group to vote in election as per their analyzation and study of political system or field and trend.
Answer:
A unanimous vote of the states was necessary to change the Articles of Confederation.
Explanation:
Ratification is the official way to confirm something, usually by vote. It is the formal validation of a proposed law.
The ratification process started when the Congress turned the Constitution over to the state legislatures for consideration through specially elected state conventions of the people.
As dictated by Article VII, the document would not become binding until it was ratified by nine of the 13 states.