I see one major problem with this statement. The problem is that it is hard to say that there was "development of blacks' rights" starting in the late 1700s. Many African Americans did resist slavery (though very few through outright rebellion). But they did not do so because their rights were being developed. Instead, they did so because of their own personal attitudes towards slavery. It is very difficult to point to any improvements in black rights during this time.
However, it is a good overall idea to try to connect resistance to slavery with the Civil Rights Movement. What you should do here is to try to say more clearly that African Americans were unwilling to accept slavery and that, after the end of slavery, they were unwilling to accept second-class citizenship. You should be sure to note, though, that they were forced to deal with segregation and other forms of oppression for about 100 years after the end of the Civil War.