[ccmonnett]

The pairing of peaceful protest and "work within the system" is ultimately what made lasting social progress in both examples.

Without the Suffragettes, the XIX Amendment would not have been written and passed. But without the XIX Amendment, women still would not have the right to vote (somewhat tautologically).

Similarly, without the civil rights movement we would not have seen the passage of the Civil Rights Act and Voting Rights Act. These acts have been instrumental in maintaining the hard-earned rights demanded by contemporary civil rights activists.

In short, I would say that protestors demand change whereas the "work within the system" codifies progress makes it last.