when did modern campaign finance regulation in the united states begin???

Answer: 1971

Question: how many nfl championships have the cleveland browns won?

Answer: four

Answer this question: who was the husband of esther in the bible??

King Xerxes I of Persia

Q: who has written the book war and peace?A: Leo Tolstoy

Input: most subscribed youtube channel in the world 2017?

Output: PewDiePie

input: What is the answer to this question? the ability of an instrument of actually measure what it is intended to measure is known as?

output:
Construct validity