The Lockheed L-2000 was Lockheed’s entry in a government-funded competition to build the United States’ first supersonic transport (SST) in the 1960s. The L-2000 lost the contract to the Boeing 2707, but that competing design was ultimately canceled for political, environmental and economic reasons.
en.wikipedia.org/wiki/Lockheed_L-2000
The Boeing 2707 was developed as the first American supersonic transport (SST). After winning a competition for a government-funded contract to build an American SST, Boeing began development at its facilities in Seattle, Washington. Rising costs and the lack of a clear market led to its cancellation in 1971 before two prototypes had been completed.
en.wikipedia.org/wiki/Boeing_2707
Finally A cool plane
The rationale of the two programs was: hey, look, the french are building an useless, faulty supersonic junk! Let’s build one too!
Or: “hey, look, the french are building a unique and profitable supersonic plane! Let’s FAIL in trying to build one!”.