What did the "October Manifesto" do?

It marked the end of unlimited autocracy in Russia.

Explanation:

The document issued by the emperor Nicholas II that, in effect, marked the end of unlimited autocracy in Russia and ushered in an era of constitutional monarchy.

The October Manifesto addressed the unrest application throughout the Russian Empire and pledged to grant basic civil liberties, including

To grant to the population the essential foundations of civil freedoms based on the principles of genuine inviolability of the person, freedom of conscience, speech, assembly and association.

Without postponing the scheduled elections to the State Duma, to admit to participation in the Duma (insofar as possible in the short time that remains before it is scheduled to convene) of all those classes of the population that now are completely deprived of voting rights; and to leave the further development of a general statute on elections to the future legislative order.

To establish as an unbreakable rule that no law shall take effect without confirmation by the State Duma and that the elected representatives of the people shall be guaranteed the opportunity to participate in the supervision of the legality of the actions of our appointed officials.

The Manifesto also introduced universal manhood suffrage in Russia which was common in some Western countries, such as France, Germany and the United States.

This document, although granting basic rights to the Russian people, did not guarantee that the Russian government would function in a democratic way. Instead, the Manifesto just stated that the people now had basic rights and a voice in legislation.

The freedom of religion clause outraged the Russian Orthodox Church because it allowed people to switch to evangelical Protestantism, which they denounced as heresy

Explanation:

Hope this helps.