"Through Colonial Doorways" by Anne Hollingsworth Wharton recounts the colonial history of the United States covers the European colonization of the Americas from the early 16th century until their incorporation into the United States of America. From the late 16th century, England, France, Spain, and the Netherlands all embarked on colonization of eastern North America. It shows how by the 1770s, 13 British colonies held 2.5 million people along the Atlantic coast east of the Appalachians.