Why do liberals falsely believe that America was founded as a melting pot when by 1870 ONLY white people could become US citizens?

The "crucible" did not refer to race, but to ethnicity. They had Germans, Italians, Serbs, Irish and Russians in a few square kilometers. Each ethnic group built their own churches, started their own social clubs and slowly began to integrate into the larger American culture. At that time, they wanted their kids to become Americans and speak perfect English. When my grandfather came here from Mexico in the 1920s. He moved to a Polish-Jewish neighborhood.

Today it is exactly the opposite. The people (especially the Mexicans) do not want to assimilate, they do not want to learn proper English. They want to recreate the old world in the new world.