Why was the United States included?

The US is unique among demo­c­ra­t­ic coun­tries at this point in time because it is the only demo­c­ra­t­ic coun­try that is known to have its own gov­ern­ment and/or a major polit­i­cal par­ty con­duct­ing influ­ence oper­a­tions direct­ed at its own cit­i­zens. This looks like­ly to con­tin­ue for the fore­see­able future.