When did the first American space station start?

The first American space station was Skylab (sometimes referred to as Skylab 1) which was made from an empty and converted Saturn V rocket case. It was launched in May 1973, and re-entered Earth's atmosphere when its orbit decayed in July 1979, long after the last crew had departed.

The only other one the US has participated in is the ISS (International Space Station) which was built by the joint effort of America, Russia, China, Korea, Japan and many other countries