The national chairperson of a major political party
a. organizes congressional campaigns
b. develops the platform upon which a presidential candidate runs
c. manages the party's headquarters
d. elects all members of the national committee

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The national chairperson of a major political party develops the platform upon which a presidential candidate runs

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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