Why Australia shifted from British to American warship designs

What would have to change for the Royal Australian Navy to keep buying British-designed ships rather than moving toward American designs after the 1960s?

He says Australia bought to match the navy it expected to fight beside, so preserving British designs would require the British-centered Far East partnership to remain strategically relevant.

Australia operated River-class frigates derived from the Royal Navy's Leander design. The strategic logic changed as the Far East Strategic Reserve and related British commitments receded. Working more closely with the United States made American-compatible ships and systems increasingly sensible. Australian procurement follows the navy with which Australia expects to fight. Interoperability and alliance geography therefore shape design selection more than national style.