Ineffective and unwanted agencies are often difficult to eliminate. this is best explained by the fact that

This is best explained by the fact that iron triangles of power benefit from their existence.
In United States politics, the iron triangle involves the strategy making relationship among the congressional boards of trustees, the bureaucracy, and interest gatherings.

The changes to agriculture in the united states since 1900 is that increased mechanization has increased food production, thereby increasing the need for labor. there has been an increased need for higher speeds of food production due the fact that the population in the united states continues to rise.

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