Working in the USA with a UK passport is a bit harder than working in the UK with a USA passport.
It's not in the EU, so you can't just go there and get a job, you have to have a visa to get a job. To get a visa, you pretty much have to have a job.
So, unless you've got some reason that you should be hired above all the other unemployed people in the USA, it's going to be tough to do.
My son-in-law, from Panama, married to a US citizen for 2 years, took just over a year after he got into the country to get his work visa approved... It took 2 years to get the visa to enter the US (NOT a work visa, but a spousal visa)
Good luck.