As Americans, we enjoy the benefits of both systems. While America is considered one of the most succesful Capitalist countries that has ever existed, we also enjoy things like public roads, libraries, education, police, fire-fighters, public parks, the military, justice system, social security, medicare, etc...all of which are publicly funded and government implemented (Socialism).
America was founded on liberty, justice, and equality. These principles don't always mesh well, and it's our continuing duty to elect people into office who represent our ideas of how to prioritize and implement the liberty, justice, and equality that we all deserve.
Even better than Capitalism, Socialism, Christianity, or Atheism...is a society that allows all of those ideologies to bring something to the table. THAT is what this country was founded on - from the many, one. E Pluribus Unum.
The U.S. Constitution
A working knowledge of history and politics