Texas Law portal This category is for laws and constitutions enacted, court cases decided, crimes committed, legal treatises written, and treaties concluded or entered into force in the year 1721. 17161717171817191720172117221723172417251726 1670s1680s1690s1700s1710s1720s1730s1740s1750s1760s1770s Subcategories This category has the following 3 subcategories, out of 3 total. B 1721 in British law (1 C, 1 P)C 1721 crimes (2 C)T 1721 treaties (1 P)