The Pentagon is currently planning to replace its current arsenal of intercontinental ballistic missiles (ICBMs) with a brand-new missile force, known as the Ground Based Strategic Deterrent (GBSD); it is estimated to cost approximately $100 billion in acquisition fees and $264 billion throughout its lifecycle until 2075 (in Then-Year dollars).
Click the link below to find a comprehensive timeline of all relevant actions taken relating to the ICBM force since the end of the Cold War, including force posture alterations, international treaties, congressional efforts, government studies, and milestones in the GBSD acquisition process.
The US Intercontinental Ballistic Missile Force: A Post-Cold War Timeline