Samsung is Korean, Alcatel-Lucent was French but now is part of Nokia. Nortel was acquired by Ericsson.
Cisco makes some backbone equipment. They were trying hard to sell a LTE "virtualized" core when I previously worked at $wireless_telco, but cisco does not make RAN components.
The only US based company I know of that is has licensed products in production use by a major telcom is Airspan [1]