In the United States today, we have what can be called a mixed economy. It is one that is predominately market-oriented, but which also has a large dose of government intervention. If the government had pursued a more consistent course, it is likely that the country's economic system would be much less mixed.
If the government had been consistent, it is likely that our system would be much farther over towards either a command economy or a pure market economy. For example, in 1937, the Supreme Court ended the policy of "substantive due process," which had made it very hard for the government to regulate economic activity. If the Court had not done this, and had been consistently pro-business, our system would likely be one in which businesses could operate with many fewer regulations. This would make us much more of a market economy and much less of a mixed economy.