What was a principle of marxism that American capitalists opposed

Rule by the working class. Or

Explanation:

The Marxist principles that American capitalist opposed would be how capital was defined. Based on the principles of Marxism capital is a social and economic relationship between people. This means that it seeks to abolish or remove capital gains in the side of economics of business people or suppliers.

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i believe it would influence their own way of understanding things. it shall be a foundation where they can draw or start an argument.   historians are also  scientists that  have their tools of analysis and expertise to unlock a variety of difficulties such as relationships of man, origin, politics, economy, and culture. based on facts and understanding on these areas, they may shade light to extract ideas and develop options to validate a hypothesis or debunk it.