William Blum in his classic book 'Killing Hope: US military and CIA interventions since WW2' has chronicled in great detail how America has used violence, ballot rigging and many other devious measures to rig elections. The object being to pro-big business/pro USA candidates into government.

In 2014 the elected President of Ukraine Yanukovich was overthrown by a CIA sponsored coup that ultimately led to the bloody civil war now ongoing in Ukraine. The war profiteers are making money out of this civil war having been given the green light by congress last year to sell anti-tank weapons and other 'defensive' weaponry to the junta ruling in Kiev.
Pax Americana!