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Production of more food--the system allowed for more food to be produced which fed the workers in an industrial economy.
The 'four-field system' rotates crops between the 4 fields no longer needing to keep one empty because one of the crops would replenish the field with nutrients while the others take nutrients away from the fields. <span />
C) about 60 million dead and parts of Europe & Asia devastated.
Correct answer: A. vetoing laws passed by Congress.
This is a significant power in the hands of the President. Congressional decision making is affected by the knowledge that in both houses of Congress, a two-thirds majority will be needed to override the President's veto. Historically, Congress has been able to override less than 10% of presidential vetoes. So Congress will seek to make sure they have sufficient votes before proceeding with passage of a bill into law ... unless they want to pass the legislation simply as a statement of principle, knowing they don't have the votes to override a veto.