Trade exists apart from capitalism, and is found in any number of alternative economic systems. Capitalism is about who has ownership of productive assets. Conflating capitalism with trade makes it seem like no alternative economic systems are possible.
Planned economies haven't worked in the US, either. For example, before Reagan deregulated the airlines, the airline schedules, routes, and fares were set by the FAA.
The result is airliners often flew nearly empty.
Once that was deregulated, a titantic shift occurred, such as the emergence of the hub-and-spoke system. Airplanes have been packed since then.
The FAA bureaucrats proved incapable of efficiently setting routes, schedules, and fares.
In the 1970s, the Energy Department decided a gas station's gas allocation. They did this for every gas station in the country. The result was simultaneous gluts and shortages of gas. Reagan deregulated that with his very first Executive Order, and the gluts, shortages, and gas lines disappeared literally overnight.