One would think that by now the issue of marriage and the simple right for two people who love one another to be together would be settled. Even in the 21st century, people ask, "What is marriage?" Although the word "marriage" isn't even mentioned in the Constitution, readers will learn why this issue has been a subject of debate for years, whether for interracial or same-sex couples. Primary source documents, quotes, and explanations of Supreme Court rulings help set the scene and tell the evolving tale of equality for marriage rights in the United States.