Azor Betts (September 13, 1740 – September 14, 1809) was an English doctor who began his practice in the Province of New York before the American Revolutionary War.
 His staunch defense of smallpox inoculation and support of the Loyalist cause led to his arrest and eventual departure to Canada.
Originally, the state of New Jersey was a single British colony, the Province of New Jersey.
 After the English Civil War, Charles II assigned New Jersey as a proprietary colony to be held jointly by Sir George Carteret and John Berkeley, 1st Baron Berkeley of Stratton.
 Eventually, the collection of land fees, or quit-rents, from colonists proved inadequate for colonial profitability.
 Sir George Carteret sold his share of the colony to the Quakers in 1673.
 Following the sale, the land was divided into East and West Jersey.
 In 1681, West Jersey adopted a constitution.
 In 1683, East Jersey adopted one as well.
 In 1702, the colonies were united again under Anne, Queen of Great Britain, and adopted a constitution in 1776.
The Protestant Revolution of 1689, sometimes called "Coode's Rebellion" after one of its leaders, John Coode, took place in the Province of Maryland when Puritans, by then a substantial majority in the colony, revolted against the proprietary government led by the Roman Catholic Charles Calvert, 3rd Baron Baltimore.
 The rebellion followed the "Glorious Revolution" in England of 1688, which saw the Protestant Monarchs William III and Mary II, replace the English, Catholic monarch, King James II.
 The Lords Baltimore lost control of their proprietary colony, and for the next 25 years, Maryland would be ruled directly by the British Crown.
 The Protestant Revolution also saw the effective end of Maryland's early experiments with religious toleration, as Catholicism was outlawed, and Roman Catholics forbidden from holding public office.
 Religious toleration would not be restored in Maryland until after the American Revolution.
The Province of Pennsylvania, also known as the Pennsylvania Colony, was founded in English North America by William Penn on March 4, 1681 as dictated in a royal charter granted by King Charles II.
 The name Pennsylvania, which translates roughly as "Penn's Woods", was created by combining the Penn surname (in honor of William's father, Admiral Sir William Penn) with the Latin word "sylvania", meaning "forest land."
 The Province of Pennsylvania was one of the two major Restoration colonies, the other being the Province of Carolina.
 The proprietary colony's charter remained in the hands of the Penn family until the American Revolution, when the Commonwealth of Pennsylvania was created and became one of the original thirteen states.
Maryland was a proprietary colony, in the hands of the Calvert family, who held it from 1633 to 1689, and again from 1715 to 1776.
 George Calvert, 1st Baron Baltimore (1580–1632) is often regarded as the founder of Maryland, but he died before the colony could be organized.
 Thus the colonial administration began with his son:
A proprietary governor is an individual authorized to govern a proprietary colony.
 Under the proprietary system, individuals or companies were granted commercial charters by the monarchs of the Kingdom of England to establish colonies.
 These proprietors then selected the governors and other officials in the colony.
 This system was used to establish several colonies on the island of Newfoundland.
 The provinces of Maryland, Carolina and several other colonies in the Americas were initially established under the proprietary system.
The Province of New York (1664–1776) was a British proprietary colony and later royal colony on the northeast coast of North America.
 As one of the Thirteen Colonies, New York achieved independence and worked with the others to found the United States.
Charter colony is one of three classes of colonial government established in the 17th century English colonies in North America, the other classes being proprietary colony and royal colony.
 The colonies of Rhode Island, Connecticut, and Massachusetts Bay were charter colonies.
 In a charter colony, Britain granted a charter to the colonial government establishing the rules under which the colony was to be governed.
 The charters of Rhode Island and Connecticut granted the colonists significantly more political liberty than other colonies.
 Rhode Island and Connecticut continued to use their colonial charters as their State constitutions after the American Revolution.
Captain Charles Calvert (1688 – February 2, 1734) was the 14th Proprietary Governor of Maryland in 1720, at a time when the Calvert family had recently regained control of their proprietary colony.
 He was appointed governor by his cousin Charles Calvert, 5th Baron Baltimore, who in 1721 came into his inheritance.
 Calvert worked to reassert the Proprietary interest against the privileges of the colonists as set out in the Maryland Charter, and to ease tensions between the Lords Baltimore and their subjects.
 Religious tension, which had been a source of great division in the colony, was much reduced under his governorship.
 Captain Calvert was replaced as governor in 1727 by his cousin Benedict Leonard Calvert, though he continued to occupy other colonial offices.
 He suffered from early senility and died in 1734.
A proprietary colony was a type of British colony mostly in North America and the Caribbean in the 17th century.
 In the British Empire, all land belonged to the ruler, and it was his prerogative to divide.
 Therefore, all colonial properties were partitioned by royal charter into one of four types: proprietary, royal, joint stock, or covenant.
 King Charles II used the proprietary solution to reward allies and focus his own attention on Britain itself.
 He offered his friends colonial charters which facilitated private investment and colonial self-government.
 The charters made the proprietor the effective ruler, albeit one ultimately responsible to English law and the king.
 Charles II gave New Netherland to his younger brother The Duke of York, who named it New York.
 He gave an area to William Penn who named it Pennsylvania.

Question: Azor Betts began his practice in which British proprietary colony?
Answer: Province of New York