The US has a welfare state. This means that those individuals who are below 60th percentile or so of the income distribution are net receivers of funds from the government during their lifetime (i.e., the net present value of what they contribute less than what they receive later in life, like Social Security and Medicare),..
European countries that have the detailed databases required to compute these numbers carefully have found that not even the second-generation (i.e., the sons of immigrants born in the country) is a net contributor to the welfare state.
Source: AEI