The disastrous Affordable Care Act (nicknamed Obamacare) had the general intention of making sure all Americans receive healthcare coverage in an "affordable" manner. Many Americans, however, would agree that this ambition is much less dire than other certain domestic issues, particularly the economy.
Therefore, the greatest long-term solution to most (if not all) of America's problems would be significant reforms to education. From this, everyone will be better equipped to gain employment (thus gain benefits) and our nation will have more people who, instead of pointing out problems, can offer solutions. A stronger, more unified nation can be created simply by improving our schools and making higher education/technical studies more affordable.