The last 100 years have demonstrated that simply creating a democracy is not enough. Without strong education systems, informed voters and economic fairness democracies can be converted into a sham democracy where there are elections but one party or person controls who can run for election, and often manufacturers pretexts to jail the most popular opposition leaders. A despot in a sham democracy may then look for pretexts to engage in good old fashioned empire building (as we see Vladimir Putin doing now in Ukraine and as China theatens to do with Taiwan).
The last century has also demonstrated that free democracy's tend to be much more productive and economically stable, so in the long run Democracies are economically stronger countries than despotic regimes or sham democracies.
The United Nations is a solution from the pre-connected world that has proved a weak and often useless organization in forwarding democracy across the globe because it includes a lot of countries controlled by strongmen who do not want to be answerable to their people. NATO, another solution from the per-connected world, also has been incapable to effectively addressing aggression against non-member Democratic states.
We need to create a new organization, an organization of Democratic States.
The organization should set up objective criteria for membership to insure verified free elections where all adults citizens can vote and all those who want to can run for office. Any country that qualifies and is admitted will then be part of a organization wide free trade zone, and an organization wide mutual defense pact. Fake democracy's or outright despots who want to bully a smaller democracy will face a united world democratic community.
Any country that moves away from being a free democracy should be expelled.
The history of the world is of a world run by Darwinism, the strongest and most brutal often dominate. Despots believe that is still the case. We have the brain power to provide a world where all persons are free and secure, but that will only happen if those who believe in Democracy band together.