The idea of Manifest Destiny changed insofar that the United States now believed that they should invade other countries that didn't have democracies and had religious prosecution and things like that and that they should help end it and make the people of those country as free as those in the US were.
In practical terms, a democracy is different from other forms of government, like a monarchy. A democracy involves citizens having the ability to pick their representatives. This is different than a monarchy, which consists of a dynasty (family) where power is passed down from one generation to the next. A democracy is also different from an autocracy, in which one leader has the ability to make all of the decisions for a country on their own without limits.
Theoretically, a democracy is different from other forms of government like an oligarchy. An oligarchy is a type of government in which power is concentrated in the hands of a few highly intelligent individuals. This is much different than democracy, as almost all citizens play a role in the countries government structure.
No it should not because it’s a dangerous place