To determine who most strongly opposed the Civil Rights Act of 1964 based on the given voting data, we need to analyze the number of "No" votes from different groups.
1. Republican Party:
- Yes votes: 27
- No votes: 6
2. Democrat Party:
- Yes votes: 46
- No votes: 21
3. Northern States:
- Yes votes: 72
- No votes: 6
4. Southern States:
- Yes votes: 1
- No votes: 21
We are interested in identifying which group had the highest opposition, indicated by the number of "No" votes.
- Members of the Republican Party had 6 "No" votes.
- Members of the Democrat Party had 21 "No" votes.
- Residents of Northern States had 6 "No" votes.
- Residents of Southern States had 21 "No" votes.
From this analysis, it's clear that the group with the highest number of "No" votes was residents of the Southern States, which had 21 votes against the Civil Rights Act of 1964.
Thus, the residents of Southern states most strongly opposed the Civil Rights Act of 1964.