Final answer:
Congressional hearings following the suffrage parade were to investigate the police superintendent for not protecting the women. The eventual victory of the 19th Amendment was a result of persistent activism and legal battles fought by suffragists like Susan B. Anthony.
Step-by-step explanation:
The congressional hearings that followed the suffrage parade were held to investigate the police superintendent for not protecting the women during the parade. Various suffrage organizations had been utilizing different tactics ranging from giving speeches and advocating for laws on the state level to more direct actions like protests and picketing. Key figures such as Mary Ann Shadd Cary and Susan B. Anthony pushed for suffrage through legal action and public demonstrations. Notably, Susan B. Anthony was arrested for voting under the principle that the 14th Amendment granted her that right. Eventually, the 19th Amendment was passed, which secured the right to vote for women, and this can be directly attributed to the brave and relentless activism of the suffragists.