One of Nixon's greatest achievements.
Nixon's greatest achievement was president was to open diplomatic relations with the People's Republic of China. Before Nixon, the US and China had had no diplomatic relations. Nixon felt that relations with China could help to put pressure on the Soviet Union. Therefore, he embarked on a secret intiative to open relations with them.
Answer: To abolish slavery.
Explanation: The 13th amendment to the United States Constitution provides that "Neither slavery nor involuntary servitude, except as a punishment for crime whereof the party shall have been duly convicted, shall exist within the United States, or any place subject to their jurisdiction."
The answer is Literacy increased among ordinary people.
I searched that just to make sure that I was right.