Question: Which dog breed originated in the United States, Treeing Walker Coonhound or Australian Stumpy Tail Cattle Dog?

Context paragraphs:
Cão Fila de São Miguel: The Cão Fila de São Miguel (Portuguese: ] ) (frequently translated into English as the "São Miguel Cattle Dog" or "Cattle Dog of São Miguel Island", but other names, such as "Azores Cattle Dog", may be used) is a dog breed of molosser type originating on São Miguel Island in the Azores, an island chain which is one of the autonomous regions of Portugal.  The breed was originally used for working with cattle.

Australian Stumpy Tail Cattle Dog: The Australian Stumpy Tail Cattle Dog is a naturally bobtailed or tailless, medium-sized breed of Cattle Dog (not to be confused with the Australian Cattle Dog, aka "Queensland Heeler").  The Australian Stumpy Tail Cattle Dog was developed in Australia to herd cattle, and descends from crosses between European herding dogs and the Australian dingo.  The name is spelled both with hyphenation, as Australian Stumpy-Tail Cattle Dog, and without, and the shorter name Stump Tail Cattle Dog is also sometimes applied.

American English Coonhound: The English Coonhound, also referred to as the American English Coonhound (by the American Kennel Club only) or the Redtick Coonhound, is a breed of coonhound that originated and is typically bred in the Southern United States.  It is descended from hunting hounds brought to America by settlers during the 17th and 18th centuries, resulting in the dogs known as the "Virginia Hounds".  The breed's first recognition came from the United Kennel Club in 1905 as the English Fox and Coonhound.  Further recognition has been granted in recent years by the American Kennel Club, first in the Foundation Stock Service and in 2011 as a fully recognized member of the hound group.

Treeing Walker Coonhound: The Treeing Walker Coonhound is a breed of hound descended from the English and American Foxhounds.  The breed originated in the United States when a dog known as "Tennessee Lead", was crossed into the Walker Hound in the 19th century.  The Treeing Walker Coonhound was recognized officially as a breed by the United Kennel Club in 1945 and by the American Kennel Club in 2012.

List of U.S. state dogs: Twelve states of the United States have designated an official state dog breed.  Maryland was the first state to name a dog breed as a state symbol, naming the Chesapeake Bay Retriever in 1964.  Pennsylvania followed the year after, naming the Great Dane as its official breed.  Dog breeds are mostly affiliated with the states that they originated in.  North Carolina chose the Plott Hound as it was the only dog breed indigenous to the state.

Hovawart: The Hovawart is a medium to large size German dog breed.  The name of the breed means "an estate guard dog", which is the original use for the breed.  The breed originated in the Black Forest region and was first described in text and paintings in medieval times.

Halls Heeler: The Halls Heeler was a dog bred by Thomas Simpson Hall to herd cattle on the Hall family's extensive properties in north-western New South Wales in the 19th century.  On "Dartbrook Station", in the Upper Hunter Valley, Hall selectively crossed the offspring of Northumberland Drover's Dogs (Border Collie lineage) that he had imported, with progeny of dingoes that he had tamed.  By 1840 he had bred the type of dog that he needed to control cattle on the massive runs that his family owned, and until he died in 1870 few of these dogs were owned and used by anyone outside the Hall family and their workers.  However the death of Thomas Hall and the break-up of the Hall estate coincided with the development of the dog show, and an interest in breeding dogs to specific criteria or standards.  The Halls Heeler was further developed into two contemporary dog breeds the Australian Cattle Dog and the Australian Stumpy Tail Cattle Dog.  The name is spelled both with the possessive apostrophe, as Hall's Heeler, and without.

Cão de Castro Laboreiro: The Cão de Castro Laboreiro, or Dog from Castro Laboreiro, or Portuguese Cattle Dog or Portuguese Watch Dog, is a dog breed of the livestock guardian dog type, originating from Castro Laboreiro in the northern mountains of Portugal.

Treeing Cur: The Treeing Cur is a breed of dog that originated in the mid-west and was first recognized by United Kennel Club on November 1, 1998, due to the efforts of Alex and Ray Kovac.  "Most Cur breeders were not well off and so they required a dog that could serve multiple purposes: hunter, guardian, and stock dog.  The result was the Treeing Cur, "which is the most varied in size and colors of the Cur breeds", according to United Kennel Club.They are primarily used to tree squirrels, raccoons, opossums, wild boars, bears, mountain lions and bobcats as well as to hunt big game.

Australian Cattle Dog: The Australian Cattle Dog (ACD), or simply Cattle Dog, is a breed of herding dog originally developed in Australia for droving cattle over long distances across rough terrain.  This breed is a medium-sized, short-coated dog that occurs in two main colour forms.  It has either brown or black hair distributed fairly evenly through a white coat, which gives the appearance of a "red" or "blue" dog.  It should not be confused with the Australian Shepherd, a similarly named but totally different breed.

Supporting paragraphs: Treeing Walker Coonhound Australian Stumpy Tail Cattle Dog
Answer: Treeing Walker Coonhound