I was going to start a new thread but this one seems to fit quite well.
For a variety of reasons US involvement in Vietnam ends in 1973 and not 1975. The US Navy turns to the growing problem of defending sealanes from Soviet submarines in tension or war.
Although the big carriers are getting S3 Viking and Seaking ASW assets, and Spruance ASW destroyers are on order to replace ageing FRAM destroyers the Sea Control Ship (SCS) and other small carrier designs appear to offer a solution similar to the WW2 jeep carriers.
The main obstacle to adding such a ship to US and NATO fleets is the absence of credible fixed wing aircraft to supplement the Seaking ASW.
With the UK looking at Harrier variants for its Though Deck cruisers, the USN looks at developing this plane.
US manufactures Convair and NA Rockwell have their own designs to bring to the table.
Canadair meanwhile is working with HS in the UK to develop an AEW version of its CL84.
The Ford administration in 1975 takes the Soviet threat seriously and encourage by SACLANT agrees to order a small carrier to work with the new Spruance class.