After the Reconstruction Amendments gave rights to the former slaves, other groups began to see the benefit of these civil rights. The 15th amendment especially gained notice. Women had been instrumental in working for the abolition of slavery. They campaigned tirelessly to help secure freedom and rights for African Americans. They began to realize that they themselves did not have these rights that they were trying to win for former slaves.
It took women another 50 years after the passage of the 15th Amendment for them to get the right to vote. The 19th, 24th, and 26th amendments were all passed to help extend the voting rights of citizens of the United States.
Below is an image of the first page of the United States Constitution. Click on the image to open a new window with more information about the 20th century amendments.