Is that 80K gross salary? If it is, that would mean that the ratio of take_home_pay/total_cost_for_employer for US is smaller than in much of Europe (which is surprising to me).
Here is what numbers for that kind of salary would look like in Croatia:
Gross yearly salary: 80 000 USD
Total cost for employer: 93 200 USD
Take home pay: 48 088 USD
(Note - this puts you in the highest tax bracket, almost no one makes that much.)
The highest federal tax rate in the US is 37% and that’s only taxed on income over 518k.
As kasey_junk points out, an employee will have federal income tax, social security and medicare payments as well as health insurance premiums removed from their paychecks. Some employers also offer additional insurance policies such as short term disability, long term disability, and life insurance. Those are optional and would be additional deductions from the employee's paycheck.