What is the setting of Starship Troopers by Robert A. Heinlein?

Starship Troopers is set at some unspecified time after the 20th Century. Vacation hops to the moon and Mars are commonplace, but so are intergalactic travel and warfare. A truly global, but apparently non-nuclear war, between the Russo-Anglo-American Alliance and the Chinese Hegemony is fought in 1985. This is the only date mentioned in the novel. Thereafter follow several generations of humans emerging from social chaos, led by honorably discharged veterans and former prisoners of war. Their status as proven defenders of the common wealth leads to the principle that only honorably discharged veterans may vote or hold public office. This creates an incentive to join the all-volunteer army.