[Freee-dame]

US public schools have been teaching that America is an oppressor nation for almost 40 years. When the first wave of Vietnamese immigrants came, in an effort to make the children feel better, the multi-cultural thing started. Instead of its being a celebration of one’s ancestral heritage, it became an all-cultures-are-equal thing.

People who came to the USA used to want to be American and celebrate our freedoms and opportunities. They didn’t want to change us into their culture.

[buwaya]

This is true.
US education used to be extremely patriotic. You could say propagandistic even, about creating a national identity.
This overt plugging of patriotism and national symbols was borrowed from France and Germany in the 19th century.
Whatever its failings, it did succeed in creating a national identity among a diverse people, especially among immigrants.
But in modern times, the last fifty years, its become the policy to do the exact opposite.