Systemic- Before WW2, Russia and US could avoid each other at a distance, but after 1945- they were face to face, Europe was divided. Neither could stay in "domain" cuz key states were located near peripheries of Soviet Union (Japan and Europe), and Europe and Japan allied with US = great importance.
State- Russian political culture emphasized absolutism instead of democracy, desired a strong leader, fear of anarchy, fear of invasion (geographically vulnerable land power that had been invaded by neighbors many times) worry/shame about backwardness (trying to prove they were vital to international relations), and secrecy (hide bad part of Russian life). US emphasized liberal democracy, pluralism, and fragmentation power, took pride in technology and expanding economy, had little fear of invasion cuz weak neighbors and separated from other major powers by two big oceans, government was not secretive and documents reached the press within days, stressed individual justice instead of class justice, foreign policy was moralistic and public and often appeared inconsistent and incoherent to public. The strength of openness and pluralism protected from bigger mistakes.
US could see everything that went in and came out but never inside Soviet Union, and the Soviets got so much chaos and white noise from America that it was difficult to hear true signals clearly (too many saying too many things = Soviets could not hear what America really wanted)