The definition of ideology we have now in the 20th century was reinforced through expected and approved behaviors. Before that it made is the first apparition as the Marxist idea, where an ideology was a way to reflect the interest of the ruling class and justify their high status that keep them in power. At first, ideology was internalized by everyone since it followed some knowledge of the Bible. Eventually, as the world grows even it they ad the freedom to choose the population was conditioned to follow this ideology that is not always beneficial for them. This is due to two principal things, people are conditioned by fear with the threats of violence: police; Court; prison. And school where we learn to obey and to internalize ideology by discipline priming us to be a non-confrontational and a productive “good citizen”.
In US politics, we can find a line dividing two distinct ideologies, the Liberal one and the conservative one. Even though there’s some resemblance between those two, depending on the person’s personality, there are big differences. First we can see that most of the time conservative ideology is followed by white catholic or people that suffer from the government’s rules. While liberal ideology is followed by Jews, African American, Latino or poor people that receive a significant share of government benefits. As we can see both of them have a distinct opinion on the governments conservative ideology believes that a large government poses a treat to individual liberty, so they prefer the government to be as small as possible. And in the other side liberal ideology believes government helps solve problems, so a bigger one could solve more and bigger ones. They also have different values. Conservatives value liberty, while liberals value equality. But the main difference between those two ideologies is their ways of seeing the government.
Althusser’s definition of ideology shows the importance of the various social apparatuses. Those apparatuses found in the society explain why people seemingly opted not to act in their best interest and always seems to turn on to supporting fascism.