Reasons clashes between ideologies communism capitalism Industries business ruled by the privately owned state sharedeconomy trade One party democracy Change Roosevelt of leader truman a black and white nature inevitable conflict hardline anti communism Truman doctrine Give supports to any nation that has been threatened communism by Marshall plan 7 Communism would thrive in extremepoverty 17b over 4 years Soviet expation a left 3m Soldiers in E Europe aiming to defence Soviet Pro America minister jumped out of the window secret police to repress civilians Czechoslovakia trioten execute or exhila anti communism leaders