Wait...you didn't....Found it?
.us is the Internet country code top‐level domain (ccTLD) for the United States and was established in 1985. Registrants of .us domains must be United States citizens, residents, or organizations, or a foreign entity with a presence in the United States. Most registrants in the country have registered for .com, .net, .org and other gTLDs, instead of .us, which has primarily been used by state and local governments despite any entity having the option of registering a .us domain.
The domain name .net is a generic top-level domain (gTLD) used in the Domain Name System of the Internet. The name is derived from network, indicating its originally intended purpose for organizations involved in networking technologies, such as Internet service providers and other infrastructure companies. However, restrictions were never enforced and the domain is a general purpose name space. It is still popular with network operators, and is often treated as an alternate to com.
And .us is newer than .net...there are also Tribalwars.asia, Tribalwars.jp, Tribalwars.bg, Tribalwars.nl and many others....