In Nexis Uni, click All Nexis Uni. From here you will see several options:
In the Category section, use Statutes and Legislation to find the constitution or statutory code both for Federal and for every state and the District of Columbia.
In the Jurisdiction section, select the Federal or State jurisdiction.
Select Advanced Search (under the search box) to limit by date, and to build a more complex search using search segments and connectors.