We present a deterministic and fully constructive proof of the Collatz Conjecture by modeling its dynamics as a 17-state Finite State Machine (FSM) defined over modular arithmetic. The FSM partitions the positive integers Z^+ into five disjoint classes based on parity and residue modulo 9, providing a complete finite representation of all possible trajectories. Within this framework, every sequence ultimately follows a canonical trajectory through three inevitable stages: an initial stage of multiples of 3, a finite transient stage of 12 coprime states, and the terminal cycle C=\1, 2, 4\. The arithmetic refinement of the map stabilizes modulo M = 2³\!\!9 = 72, producing a closed deterministic residue system. Within this finite modular structure, the Collatz map admits no additional cycles or unbounded trajectories: every path is funneled through the unique gateway state S₁₁ (residue 8 mod 9) into the invariant cycle C. The result establishes global convergence of the Collatz map, supported by computational verification up to 10^7.
Amarachukwu Nwankpa (Wed,) studied this question.