Marx and Engels Communist Manifesto was published in 1848. Connection??
However, I was in public schools from 1944 - 1960 and they taught American patriotism and Christian values as well as the three Rs, American and World history, etc. It wasn't until later, around the early '60s IIRC, that things started changing.
You were being taught by people who were the age of my parents. These people still had parents and grandparents who literally lived the pioneer experience of hacking a civilization out of the wilderness. The goal of the earliest education activists in the mid-1800s ( and other education leaders of the early 20th century until Bill Ayer, today) was to eliminate this influence. They have and are succeeding.
Then there is the socialist object lesson that **all** children who have from the very beginning of government schools have experienced. ALL children who have ever attended government schools learn ( simply by attending) that government has the power to take from the neighbor to pay for a service their parents want for FREE!
If children are trained to be comfortable with taking money from their neighbor for education, then why not social security, health care, prescription drugs, New Deals, Great Societies, college tuition, free transportation, ...even free entertainment?