Changes to immigration law might be good, but cutting numbers of immigrants is bad for the long term economic growth of the US. The US birth rate without immigrants is dropping creating irreversible downward trend in US population-- increasing percentage of aged and decreasing percentage of working young-- we are heading to a situation like Japan which is becoming an irreversible trend for the US. It is the higher birthrate of a growing immigrant population in the US which is preventing this. No amount of incentives, laws, or penalties can change this as women age out of fertility and as lower birth rates have shrunk the number of women of child bearing age-- except for young immigrants.