federate
🇺🇸
/ˈfedəreɪt/
🇬🇧
/ˈfedəreɪt/
To combine different groups or states under a single central authority while allowing them to keep some control over their own affairs.
The states agreed to federate and form a single nation.
这些州同意联合起来形成一个单一的国家。