"The first immigrants to Europe arrived thousands of years ago from central Asia. Most pre-contact Europeans lived together in small villages. Because the continent was very crowded, their lives were ruled by strict hierarchies within the family and outside it to control resources. Europe was highly multi-ethnic, and most tribes were ruled by hereditary leaders who commanded the majority “commoners.” These groups were engaged in near constant warfare.
"Pre-contact Europeans wore clothing made of natural materials such as animal skin and plant and animal-based textiles. Women wore long dresses and covered their hair, and men wore tunics and leggings. Both men and women liked to wear jewelry made from precious stones and metals as a sign of status. Before contact, Europeans had very poor diets. Most people were farmers and grew wheat and vegetables and raised cows and sheep to eat. They rarely washed themselves, and had many diseases because they often let their animals live with them.
"Religion infused every part of Europeans’ lives. Europeans believed in one supreme deity, a father figure, who they believed was made of three parts, and they particularly worshiped the deity’s son. They claimed that their god had given humans domination over the earth. They built elaborate temples to him and performed ceremonies in which they ate crackers and drank wine and believed it was the body and blood of their god, who would provide them with entrance into a wondrous afterlife called heaven when they died. Many wars were fought over disagreements about the details of this religion, each group believing their interpretation was the right one that should be spread across the land."
Now imagine that is part of a textbook that has entire chapters on the Mississippian polities of the 1200s and a detailed account of the diplomatic situation of the southeastern provinces in the 1400s and 1500s, an enormous section that goes through the history of the rise of the Triple Alliance in Mexico and goes through the rule of each tlatoani and their policies, the heritage of Teotihuacan and its legacy in later Mesoamerican politics, elaborate descriptions of the trade routes that connected and drove various nations in North America. Long explanations of the rise of various religious movements such as the calumet ceremony and Midewiwin, and how they affected political agendas and artistic trends. Pages and pages and pages going through the past thousand years of American history century by century.
And these three paragraphs are the only mention of European history before the year 1500.
If your textbook of North American history goes into the details of the Middle Ages, the Reformation and Renaissance, the Silk Road, and European monarchies, and you don’t include equal description of the Mississippian coalescence and dispersal, Haudenosaunee-Algonquian relations, the Woodlands, trans-plains, and southwestern trade systems, the Mexica conquests and the Fifth Sun ideology with explicit naming of various places and leaders, then your textbook is inadequate.
Why do you include those “pre-contact” European things? Because they explain the motivations and reasons for what Europeans did. But people largely imagine North America as this timeless place and don’t recognize that pre-contact American history had just as much of an effect on post-contact history because it provides explanations of the motivations and reasonings behind indigenous peoples’ actions.
But of course, that would require people to recognize that indigenous people had their own histories and agendas and agency that affected the course of history rather than making them a passive recipient of European historical force.