Nothing since 1960s?
Actually, a lot of stuff has been invented over here but because it is done *in collaboration with* American companies (we supply the brains, they supply the money) it tends to be the Yanks who get the kudos.
And what they don't get through funding 'our boys' (and gals), they get by buying up the company a short time later... the latest "American" whizzo AFV, the Stryker, is simply an updated version of a Swiss design - the Mowag Pirhana - that was used by other nations (including Australia and Canada) for years before the Americans "invented' them... Mowag is now part of General Dynamics' Land Systems division...
In the early- to mid-90's there was an entire floor of a building at a BAE Systems site that had British designers, American Management and Admin staff and was working on something that started as a Joint Venture for UK/US forcces but ended up as a solely-US 'toy' - not because the UK didn't want/need it, but because it was so much better than anything the purely American projects had come up with and the Americans decided to 'pull out' of, and shut down, the JV - but kept all "their" intellectual property and carried on with "their" project... which just happened to bear an uncanny resemblance to what the BAE bods had come up with, but which BAE were no longer supposed to be playing with (I cannot say more as this much is within the public arena - any more and I run foul of the Official Secrets Act. Unlike certain members of our current Government, I know how to treat stuff labelled "Confidential", "Restricted" and "Secret"...).