Blood/Class Blood Status & Class Structure The main subject of this war is blood. The two minorities of the wizarding world are fighting amongst themselves based on their blood status. Purebloods desire a return to old wizarding values and traditions, and muggle-borns desire a more progressive and accepting attitude from the wizarding world. So, to say that this is a big deal would be a huge understatement.
Blood status breaks down as such:
Pureblood - Can trace their lineage free of muggles for at least 10 generations. (15% of society)
Full-blood - All grandparents were magical. (45% of society)
Half-blood - Only one magical parent OR at least one muggle grandparent. (25% of society)
Muggle-born - Witch/wizard born to muggle parents. (15% of society)
Squib - Non-magic child born to magical parents, most often purebloods and full-bloods. (Less than 1% of society)
The majority of wizards and witches are full-bloods or half-bloods, and most do not make a big deal out of blood status. Because of this, class structure is primarily based on monetary status, rather than blood status.
Class structure is divided into three general categories:
Society Elite - These are the wealthy purebloods (ex. Black, Malfoy, Lestrange, Rosier, Crouch, Bagnold, etc.), and some full-bloods. A few extremely wealthy half-bloods and muggleborns can aspire to this category, but they are considered "new money" and still looked down upon by the purebloods.
Middle Class - This is the largest category, made up of comfortable to rich wizards, regardless of blood status. Most people would fall into this category, and range from upper-middle class (with an estate or manor and one house elf) to lower-middle class (with a modest home, no financial struggle, and no elf).
Working Class - These are the wizards and witches who are struggling financially. Their homes are small and crowded, and they can barely make ends meet. Many working class wizards come from muggle-born families, however, a number of working class wizards are also purebloods whose family has long since squandered their wealth (ex. Gaunt, Weasley, Carrow, etc.). And of course, several full-bloods and half-bloods also fall into this category.
Most wizards judge each other based on class and consider it extremely important when choosing spouses, friends, etc. This is typically how society functions, with the class structures dictating association. However, many purebloods still hold purist beliefs, preferring working class purebloods over wealthy half-bloods and muggle-borns. So purism still exists, and the past few years have brought the issue of blood status back to the forefront of people's minds. Once considered a dead issue, one that wizarding society has moved away from, purism has returned with the rise of the Death Eaters. No matter how much people try to ignore it, blood status has become the proverbial elephant in the room.