The US has the social security program, to which both employer and employee make mandatory payroll contributions, but it pays very modestly in retirement. Many employees now contribute to their own self-managed retirement savings/investments. Employer sponsored pensions are disappearing.
Does the US not have a mandatory pension program? We have "super annuation" here which is a mandatory payment employers have to make into our pension accounts, minimum being 7% on top of our salary. Very rarely a company will add more to your super.