Interesting pattern. Probably a coincidence.

4 assassinated presidents (Lincoln, Garfield, McKinley, Kennedy) all tied to major currency shifts. 

Timeline patterns:
80 years: US Dollar (1785) Lincoln (1865) → FDR (1945) → 2025?
62 years: McKinley (1901) → Kennedy (1963) → 2025?
144 (golden mean) years since Garfield (1881)