Post 1956, several battles are fought between North and South Vietnam.  The Gulf of Tonkin Resolution of 1964 gives US President LBJ authority to increase US involvement in the Vietnam War. This is followed by targeted bombings under Operation Rolling Thunder by the US and counter offensives by the Viet Cong like the Tet Offensive. Agent Orange and Napalm droppings lead to a massive ecocide with severe after effects on the human population. Paris Accords of 1973 call for a ceasefire and North Vietnam triggers one last offensive towards reunification.