They allowed him to make those moves as long as he promised to go no further
Answer: wait what I meant to say is yes
Explanation:
The United States was founded on equal rights, however even though it was founded on equal rights doesn't mean that the society accepted this. There are many people in today's society that don't accept the others who are trying to express themselves. Even in a hundred years, the society won't accept equality because of what their parents have thought them.
the answer to why it was so effective is he put effective words and tone into it